Web platform support

Baseline says which web features work across the major browsers. This page puts niso next to it: for each feature in web-features, its Baseline status on the web and how many of its web-platform-tests subtests pass in niso’s headless run, on Linux and on macOS. The data is tests/wpt/baseline.json, which cargo run --release -p niso-wpt -- --update records with the expectations it scores; how it’s computed is in the WPT notes. Click a column to sort it.

Read a status as a lower bound. Not run isn’t failing: reftests and testdriver tests don’t all run yet, so a feature tested only by them has no pass rate. Full means every subtest that ran passed, not that every test ran. A feature’s pass rate is only as good as WPT’s mapping of tests to it, and subtest counts for tests that didn’t finish come from Chrome’s run. Engines: niso’s WPT run uses QuickJS; Node (through niso-napi) and Porffor have no recorded run yet. The interfaces column links to the reference pages of the interfaces whose members web-features maps to the feature. Pages about a feature show the same data in a banner at the top.

WPT fea36e49dd, web-features 3.45.0, subtest counts for tests that didn't finish from chrome-157.0.8103.38-linux-22.04-8c206f8b82. Results recorded at f3b4fa8, 2026-11-10, scored on linux. Excluded features are left out of the totals.

Widely available

79 of 334 features with at least 20 subtests pass at least 90% of them

12.6% of all 1,575,968 subtests that ran pass

Counting every feature alike: 122 of 579 pass at least 90%, 69 pass all; mean pass rate 50%

Newly available

9 of 61 features with at least 20 subtests pass at least 90% of them

28.5% of all 37,173 subtests that ran pass

Counting every feature alike: 10 of 110 pass at least 90%, 4 pass all; mean pass rate 30%

Limited availability

1 of 5 features with at least 20 subtests pass at least 90% of them

66.1% of all 1,149 subtests that ran pass

Counting every feature alike: 2 of 446 pass at least 90%, 2 pass all; mean pass rate 43%

Any Baseline statusWidely availableNewly availableLimited availabilityAny support in nisoFullPartialNot yetNot runNo WPT testsExcluded

Feature	On the web	niso	Linux	macOS	Subtests	Tests not run	Interfaces
::backdrop backdrop	Widely available	Not yet	0.0%	0.0%	0 / 8	needs-reftests 17, other 1
::before and ::after before-after	Widely available	Partial 12%	12%	12%	3 / 25	needs-reftests 4
::file-selector-button file-selector-button	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 3, other 2
::first-letter first-letter	Widely available	Partial 6.5%	6.5%	6.5%	6 / 91	needs-reftests 45, other 3
::first-line first-line	Widely available	Partial 0.7%	0.7%	0.7%	1 / 142	needs-reftests 26, other 5
::placeholder placeholder	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 3, other 2
:default default	Widely available	Not yet	0.0%	0.0%	0 / 2
:dir() dir-pseudo	Widely available	Partial 1.5%	1.5%	1.5%	1 / 64	needs-reftests 19
:empty empty	Widely available	Full	100%	100%	1 / 1	needs-reftests 1
:focus-visible focus-visible	Widely available	Partial 26%	26%	29%	52 / 193
:focus-within focus-within	Widely available	Partial 26%	26%	26%	5 / 19	needs-reftests 18
:has() has	Widely available	Partial 45%	45%	45%	1364 / 2983	needs-reftests 26, other 5
:indeterminate indeterminate	Widely available	Partial 22%	22%	22%	2 / 9	needs-reftests 1
:is() is	Widely available	Partial 25%	25%	25%	17 / 68	needs-reftests 7
:lang() lang	Widely available	Partial 56%	56%	56%	30 / 53	needs-reftests 36, not-html 3
:modal modal	Widely available	Not yet	0.0%	0.0%	0 / 7
:not() not	Widely available	Partial 29%	29%	29%	153 / 525	needs-reftests 4
:nth-child() nth-child	Widely available	Full	100%	100%	17 / 17	needs-reftests 2, other 1
:nth-child() of <selector> nth-child-of	Widely available	Partial 50%	50%	50%	1 / 2	needs-reftests 65
:nth-of-type() pseudo-classes nth-of-type	Widely available	Full	100%	100%	26 / 26	needs-reftests 12
:placeholder-shown placeholder-shown	Widely available	Partial 57%	57%	57%	8 / 14	needs-reftests 3
:read-only and :read-write read-write-pseudos	Widely available	Partial 19%	19%	19%	5 / 26	needs-reftests 2
:root root	Widely available	Not run its tests are not-html			0 / 0	not-html 3, other 1, needs-reftests 1
:scope (pseudo-class) scope-pseudo	Widely available	Not yet	0.0%	0.0%	0 / 4	needs-reftests 1
:target target	Widely available	Not yet	0.0%	0.0%	0 / 2	not-html 5, needs-reftests 2
:user-valid and :user-invalid user-pseudos	Widely available	Partial 7.1%	7.1%	7.1%	1 / 14
:where() where	Widely available	Partial 64%	64%	64%	11 / 17	other 2
@charset charset	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 52, other 18
@counter-style counter-style	Widely available	Partial 48%	48%	48%	57 / 117	needs-reftests 66, manual 1
@font-face font-face	Widely available	Partial 28%	28%	28%	4 / 14	needs-reftests 18, other 3	CSSFontFaceRule
@import import	Widely available	Partial 73%	73%	73%	28 / 38	needs-reftests 29, other 2, manual 1	CSSImportRule
@namespace namespace	Widely available	Full	100%	100%	71 / 71	needs-reftests 73, not-html 51, other 1	CSSNamespaceRule
@supports supports	Widely available	Partial 49%	49%	49%	52 / 106	needs-reftests 116	CSSSupportsRule
@supports (compatibility prefix) supports-compat	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
<a> a	Widely available	Partial 75%	75%	75%	148 / 196	other 1	HTMLAnchorElement
<abbr> abbr	Widely available	No WPT tests			0 / 0
<address> address	Widely available	No WPT tests			0 / 0
<article> article	Widely available	No WPT tests			0 / 0
<aside> aside	Widely available	No WPT tests			0 / 0
<audio> audio	Widely available	Partial 36%	36%	36%	12 / 33	needs-reftests 5, manual 5, other 3	HTMLAudioElement
<b> b	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
<base> base	Widely available	Partial 89%	89%	89%	1271 / 1425	needs-reftests 5, not-html 3	HTMLBaseElement
<bdi> bdi	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 17
<bdo> bdo	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 4
<blockquote> blockquote	Widely available	No WPT tests			0 / 0
<body> body	Widely available	No WPT tests			0 / 0		HTMLBodyElement
<br> br	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2	HTMLBRElement
<button> button	Widely available	Partial 58%	58%	58%	188 / 319	needs-reftests 17, other 2	HTMLButtonElement
<canvas> canvas	Widely available	Partial 68%	68%	68%	143 / 208	needs-reftests 4, manual 1	HTMLCanvasElement
<cite> cite	Widely available	No WPT tests			0 / 0
<code> code	Widely available	No WPT tests			0 / 0
<data> data	Widely available	No WPT tests			0 / 0		HTMLDataElement
<del> del	Widely available	Full	100%	100%	1 / 1		HTMLModElement
<details> details	Widely available	Partial 61%	61%	61%	8 / 13	needs-reftests 26, other 7	HTMLDetailsElement, HTMLElement
<dfn> dfn	Widely available	No WPT tests			0 / 0
<dialog> dialog	Widely available	Partial 2.5%	2.5%	2.5%	6 / 235	needs-reftests 33, other 11	HTMLDialogElement
<div> div	Widely available	Full	100%	100%	1 / 1		HTMLDivElement
<em> em	Widely available	No WPT tests			0 / 0
<embed> embed	Widely available	Partial 25%	25%	25%	7 / 27	needs-reftests 5, other 1	HTMLEmbedElement
<fieldset> and <legend> fieldset	Widely available	Partial 63%	63%	63%	209 / 328	needs-reftests 41, manual 25, other 8	HTMLFieldSetElement, HTMLLegendElement
<figure> and <figcaption> figure	Widely available	Partial 18%	18%	18%	2 / 11	needs-reftests 1
<form> form	Widely available	Partial 23%	23%	23%	161 / 699	other 6	HTMLFormElement
<h1> through <h6> headings	Widely available	Full	100%	100%	1 / 1		HTMLHeadingElement
<head> head	Widely available	No WPT tests			0 / 0		HTMLHeadElement
<header> and <footer> header-footer	Widely available	No WPT tests			0 / 0
<hgroup> hgroup	Widely available	No WPT tests			0 / 0
<hr> hr	Widely available	Full	100%	100%	21 / 21	needs-reftests 5	HTMLHRElement
<html> html	Widely available	No WPT tests			0 / 0		HTMLHtmlElement
<i> i	Widely available	No WPT tests			0 / 0
<iframe> iframe	Widely available	Partial 9.8%	9.8%	9.8%	8 / 81	other 5, needs-reftests 3	HTMLIFrameElement
<img> img	Widely available	Partial 24%	24%	24%	129 / 537	needs-reftests 12, other 2	HTMLImageElement
<input type="button"> input-button	Widely available	Partial 80%	80%	80%	8 / 10
<input type="checkbox"> input-checkbox	Widely available	Partial 50%	50%	50%	12 / 24	needs-reftests 7, other 1	HTMLInputElement
<input type="file" multiple> input-file-multiple	Widely available	Not run its tests are manual			0 / 0	manual 1
<input type="file"> input-file	Widely available	Partial 3.8%	3.8%	3.8%	1 / 26	not-html 1, manual 1, other 1
<input type="hidden"> input-hidden	Widely available	Partial 30%	30%	30%	3 / 10
<input type="image"> input-image	Widely available	Not yet	0.0%	0.0%	0 / 33	needs-reftests 1
<input type="number"> input-number	Widely available	Partial 76%	76%	76%	36 / 47	needs-reftests 1, other 1	HTMLInputElement
<input type="password"> input-password	Widely available	Full	100%	100%	6 / 6	needs-reftests 1
<input type="radio"> input-radio	Widely available	Partial 54%	54%	54%	26 / 48	needs-reftests 2
<input type="range"> input-range	Widely available	Partial 76%	76%	76%	26 / 34	needs-reftests 14
<input type="reset"> input-reset	Widely available	Not yet	0.0%	0.0%	0 / 6
<input type="search"> search-input-type	Widely available	Full	100%	100%	2 / 2
<input type="submit"> input-submit	Widely available	Not yet	0.0%	0.0%	0 / 21
<input> input	Widely available	Partial 35%	35%	35%	428 / 1189	needs-reftests 11, other 9, manual 3, not-html 1	HTMLInputElement
<ins> ins	Widely available	Full	100%	100%	1 / 1
<kbd> kbd	Widely available	No WPT tests			0 / 0
<label> label	Widely available	Partial 12%	12%	12%	9 / 73	other 2	HTMLLabelElement
<link rel="modulepreload"> modulepreload	Widely available	Partial 65%	65%	65%	67 / 103
<link rel="preconnect"> link-rel-preconnect	Widely available	Partial 75%	75%	75%	3 / 4
<link rel="preload"> link-rel-preload	Widely available	Partial 15%	15%	15%	91 / 591	needs-reftests 1
<link> link	Widely available	Partial 79%	79%	79%	117 / 148	needs-reftests 7, other 3	HTMLLinkElement
<main> main	Widely available	No WPT tests			0 / 0
<mark> mark	Widely available	No WPT tests			0 / 0
<menu> menu	Widely available	No WPT tests			0 / 0		HTMLMenuElement
<meta> meta	Widely available	Partial 0.6%	0.6%	0.6%	1 / 146		HTMLMetaElement
<meter> meter	Widely available	Partial 1.6%	1.6%	1.6%	1 / 62	needs-reftests 6	HTMLMeterElement
<nav> nav	Widely available	No WPT tests			0 / 0
<object> object	Widely available	Partial 17%	17%	17%	8 / 45	needs-reftests 7, other 3	HTMLObjectElement
<ol>, <ul>, and <li> list-elements	Widely available	Partial 11%	11%	11%	5 / 42	needs-reftests 61, manual 1	HTMLLIElement, HTMLOListElement, HTMLUListElement
<output> output	Widely available	Not yet	0.0%	0.0%	0 / 3		HTMLOutputElement
<p> p	Widely available	Full	100%	100%	1 / 1		HTMLParagraphElement
<picture> picture	Widely available	Partial 6.6%	6.6%	6.6%	1 / 15		HTMLPictureElement
<pre> pre	Widely available	Full	100%	100%	1 / 1	needs-reftests 2	HTMLPreElement
<progress> progress	Widely available	Full	100%	100%	19 / 19	needs-reftests 1	HTMLProgressElement
<q> q	Widely available	No WPT tests			0 / 0		HTMLQuoteElement
<ruby> ruby	Widely available	Not run its tests are needs-reftests			0 / 0	other 1, needs-reftests 1
<s> s	Widely available	No WPT tests			0 / 0
<samp> samp	Widely available	No WPT tests			0 / 0
<script> and <noscript> script	Widely available	Partial 54%	54%	54%	568 / 1046	worker-variant 11, not-html 10	HTMLScriptElement
<search> search	Widely available	Partial 95%	95%	95%	20 / 21
<section> section	Widely available	No WPT tests			0 / 0
<select> select	Widely available	Partial 66%	66%	66%	291 / 438	needs-reftests 48, other 8, manual 2	HTMLOptGroupElement, HTMLOptionElement, HTMLSelectElement
<slot> slot	Widely available	Partial 1.0%	1.0%	1.0%	2 / 185	needs-reftests 16	HTMLSlotElement
<small> small	Widely available	No WPT tests			0 / 0
<source> source	Widely available	Partial 22%	22%	22%	9 / 40		HTMLSourceElement
<span> span	Widely available	No WPT tests			0 / 0		HTMLSpanElement
<strong> strong	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
<style> style	Widely available	Partial 38%	38%	38%	13 / 34	tentative 11, needs-reftests 3, not-html 2, other 1	HTMLStyleElement
<sub> and <sup> sub-sup	Widely available	No WPT tests			0 / 0
<template> template	Widely available	Partial 69%	69%	69%	715 / 1029	other 7, needs-reftests 3, not-html 1	HTMLTemplateElement
<textarea> textarea	Widely available	Partial 48%	48%	48%	25 / 52	needs-reftests 13, other 5, manual 3, not-html 1	HTMLTextAreaElement
<time> time	Widely available	Partial 50%	50%	50%	4 / 8		HTMLTimeElement
<title> title	Widely available	Partial 75%	75%	75%	51 / 68	not-html 4	HTMLTitleElement
<u> u	Widely available	No WPT tests			0 / 0
<var> var	Widely available	No WPT tests			0 / 0
<video> video	Widely available	Partial 38%	38%	38%	25 / 65	needs-reftests 12, manual 5, other 2	HTMLMediaElement, HTMLVideoElement
<wbr> wbr	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
2D canvas canvas-2d	Widely available	Partial 77%	77%	77%	1209 / 1553	needs-reftests 196, manual 8, other 2, tentative 1	CanvasGradient, CanvasPattern, CanvasRenderingContext2D, ImageData, Path2D, TextMetrics
2D transforms transforms2d	Widely available	Partial 94%	94%	94%	4504 / 4782	needs-reftests 581, other 15, manual 1
3D transforms transforms3d	Widely available	Partial 89%	89%	89%	607 / 676	needs-reftests 159, other 18
Abortable fetch abortable-fetch	Widely available	Partial 72%	72%	72%	128 / 177	worker-variant 6
AbortController and AbortSignal aborting	Widely available	Partial 97%	97%	97%	70 / 72	other 3	AbortController, AbortSignal
AbortSignal.any() abortsignal-any	Widely available	Full	100%	100%	28 / 28
AbortSignal.timeout() abortsignal-timeout	Widely available	No WPT tests			0 / 0
Absolute positioning absolute-positioning	Widely available	Partial 63%	63%	63%	119 / 186	needs-reftests 54, other 1
accesskey accesskey	Widely available	Partial 20%	20%	20%	1 / 5
Alerts alerts	Widely available	Not run its tests are manual			0 / 0	manual 1
align-content in block layouts align-content-block	Widely available	Partial 75%	75%	75%	138 / 183	needs-reftests 9
all all	Widely available	Partial 51%	51%	51%	528 / 1016	needs-reftests 9, other 1
ANGLE_instanced_arrays WebGL extension angle-instanced-arrays	Widely available	No WPT tests			0 / 0
Animatable clipping paths clip-path-animatable	Widely available	Partial 99%	99%	99%	171 / 172	needs-reftests 76, other 1
animation-composition animation-composition	Widely available	Partial 42%	42%	42%	9 / 21
Animations (CSS) animations-css	Widely available	Partial 56%	56%	56%	649 / 1148	manual 64, other 46, needs-reftests 35	CSSKeyframeRule, CSSKeyframesRule
appearance appearance	Widely available	Full	100%	100%	831 / 831	needs-reftests 20
ARIA attribute reflection aria-attribute-reflection	Widely available	Full	100%	100%	41 / 41		Element, ElementInternals
Array (initial support) array	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array at() array-at	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array by copy array-by-copy	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array copyWithin() array-copywithin	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array fill() array-fill	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array find() and findIndex() array-find	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array findLast() and findLastIndex() array-findlast	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array flat() and flatMap() array-flat	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array grouping array-group	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array includes() array-includes	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array iteration methods array-iteration-methods	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array iterators array-iterators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array splice() array-splice	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array.from() array-from	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array.fromAsync() array-fromasync	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array.isArray() array-isarray	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Array.of() array-of	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
aspect-ratio aspect-ratio	Widely available	Partial 91%	91%	91%	272 / 296	needs-reftests 246, other 4
Async functions async-await	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Async generators async-generators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Async iterators and the for await..of loop async-iterators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
attr() (content only) attr-contents	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 83, other 9
AudioWorklet audio-worklet	Widely available	Partial 4.1%	4.1%	4.1%	8 / 191
autofocus autofocus	Widely available	Partial 5.6%	5.6%	5.6%	3 / 53
Autonomous custom elements autonomous-custom-elements	Widely available	Partial 80%	80%	80%	2410 / 3010	other 8, not-html 4, needs-reftests 1	CustomElementRegistry, Window
AVIF avif	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
background background	Widely available	Partial 88%	88%	88%	46 / 52	manual 218, needs-reftests 156, other 28
background-blend-mode background-blend-mode	Widely available	Full	100%	100%	45 / 45	needs-reftests 2, other 1
background-clip background-clip	Widely available	Partial 68%	68%	68%	20 / 29	needs-reftests 27, other 14
background-color background-color	Widely available	Partial 97%	97%	97%	188 / 192	needs-reftests 73, other 11
background-image background-image	Widely available	Partial 71%	71%	71%	262 / 365	needs-reftests 55, other 13
background-origin background-origin	Widely available	Full	100%	100%	19 / 19	needs-reftests 22
background-position background-position	Widely available	Partial 98%	98%	98%	918 / 930	needs-reftests 140, other 24, manual 2
background-repeat background-repeat	Widely available	Full	100%	100%	20 / 20	needs-reftests 52, other 12
background-size background-size	Widely available	Partial 95%	95%	95%	392 / 412	needs-reftests 260, other 8
BarProp barprop	Widely available	Not yet	0.0%	0.0%	0 / 5
Base64 encoding and decoding base64encodedecode	Widely available	Partial 81%	81%	81%	620 / 760
Beacons beacons	Widely available	Partial 27%	27%	27%	28 / 102
BigInt bigint	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
BigInt to i64 conversion (WebAssembly) wasm-bigint	Widely available	No WPT tests			0 / 0
BigInt64Array bigint64array	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
BMP bmp	Widely available	No WPT tests			0 / 0
Border images border-image	Widely available	Partial 99.7%	99.7%	99.7%	1942 / 1946	needs-reftests 72, other 3
border-radius border-radius	Widely available	Partial 98%	98%	98%	91 / 92	other 49, needs-reftests 45, tentative 12
Borders borders	Widely available	Partial 99%	99%	99%	383 / 385	other 621, needs-reftests 531
box-shadow box-shadow	Widely available	Partial 71%	71%	71%	82 / 115	needs-reftests 42, tentative 15, other 5
box-sizing box-sizing	Widely available	Partial 81%	81%	81%	84 / 103	needs-reftests 77, other 2
BroadcastChannel broadcast-channel	Widely available	Partial 61%	61%	61%	47 / 76		BroadcastChannel
Brotli compression brotli	Widely available	No WPT tests			0 / 0
Bulk memory operations (WebAssembly) wasm-bulk-memory	Widely available	Partial 99.9%	99.9%	99.9%	8127 / 8134
calc() calc	Widely available	Partial 62%	62%	62%	345 / 551	needs-reftests 47, other 1
calc() keywords calc-constants	Widely available	Partial 97%	97%	97%	228 / 233
Canvas createConicGradient() canvas-createconicgradient	Widely available	Full	100%	100%	9 / 9	needs-reftests 2	CanvasRenderingContext2D, OffscreenCanvasRenderingContext2D
Canvas reset() canvas-reset	Widely available	Partial 96%	96%	96%	84 / 87	needs-reftests 24	CanvasRenderingContext2D, OffscreenCanvasRenderingContext2D
Canvas roundRect() canvas-roundrect	Widely available	Full	100%	100%	168 / 168		CanvasRenderingContext2D, OffscreenCanvasRenderingContext2D
cap unit cap	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 1
captureStream() for <canvas> capture-stream-canvas	Widely available	Not yet	0.0%	0.0%	0 / 2
caret-color caret-color	Widely available	Partial 96%	96%	96%	271 / 280	manual 15, needs-reftests 10
Cascade layers cascade-layers	Widely available	Partial 47%	47%	47%	71 / 149	needs-reftests 4, other 2	CSSLayerBlockRule
Case-insensitive attribute selector case-insensitive-attributes	Widely available	No WPT tests			0 / 0
ch unit ch	Widely available	Not yet	0.0%	0.0%	0 / 11	needs-reftests 13
Change event change-event	Widely available	Partial 78%	78%	78%	11 / 14		HTMLElement
Channel messaging channel-messaging	Widely available	Partial 88%	88%	88%	340 / 385	worker-variant 4	MessageChannel, MessageEvent, MessagePort
checkVisibility() check-visibility	Widely available	Not yet	0.0%	0.0%	0 / 21		Element
Classes class-syntax	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Clip path boxes clip-path-boxes	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 14
clip-path clip-path	Widely available	Partial 50%	50%	50%	3 / 6	needs-reftests 160, other 3
Clipboard events clipboard-events	Widely available	Not yet	0.0%	0.0%	0 / 22	manual 2
Color color	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 24, other 2
color-gamut media query color-gamut	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 5
color-mix() color-mix	Widely available	Partial 95%	95%	95%	1754 / 1832	needs-reftests 9
color-scheme color-scheme	Widely available	Partial 78%	78%	78%	110 / 141	needs-reftests 25, other 1
color() color-function	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 56
COLRv0 colrv0	Widely available	No WPT tests			0 / 0
column-fill column-fill	Widely available	Partial 21%	21%	21%	55 / 255	needs-reftests 151, other 55
column-span column-span	Widely available	Partial 62%	62%	62%	5 / 8	needs-reftests 137, other 48
Composition events composition-events	Widely available	No WPT tests			0 / 0
Compression streams compression-streams	Widely available	Partial 1.1%	1.1%	1.1%	8 / 678	worker-variant 38
Conic gradients conic-gradients	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 18
Console console	Widely available	Partial 49%	49%	49%	53 / 107	manual 1
Constraint validation API constraint-validation	Widely available	Partial 0.1%	0.1%	0.1%	1 / 958	manual 14, other 2
Constructed stylesheets constructed-stylesheets	Widely available	Not yet	0.0%	0.0%	0 / 65	needs-reftests 2
contain contain	Widely available	Full	100%	100%	1 / 1	needs-reftests 10, other 3
contain-intrinsic-size contain-intrinsic-size	Widely available	Partial 16%	16%	16%	133 / 808	needs-reftests 28
Container queries (size) container-queries	Widely available	Partial 0.3%	0.3%	0.3%	3 / 830	needs-reftests 44, other 1	CSSContainerRule
Content content	Widely available	Partial 97%	97%	97%	42 / 43	needs-reftests 93, other 44, manual 1
Content Security Policy (CSP) csp	Widely available	Partial 31%	31%	32%	1174 / 3669	worker-variant 114, tentative 9, needs-reftests 8	Document
contenteditable contenteditable	Widely available	Partial 0.7%	0.7%	0.7%	2 / 285	needs-reftests 4, manual 1
Cookies cookies	Widely available	Partial 7.7%	7.7%	7.7%	93 / 1204		Document
CORS cors	Widely available	Partial 20%	20%	20%	96 / 463
counter-set counter-set	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
Counters (CSS) counters	Widely available	Partial 78%	78%	78%	109 / 138	needs-reftests 219, other 108
createImageBitmap createimagebitmap	Widely available	Partial 20%	20%	20%	68 / 328	needs-reftests 5	ImageBitmap
Credential management credential-management	Widely available	Partial 21%	21%	21%	32 / 149
CSS object model css-object-model	Widely available	Partial 55%	55%	55%	123 / 221	not-html 1, needs-reftests 1	CSS, CSSConditionRule, CSSGroupingRule, CSSMediaRule, CSSRule, CSSRuleList, CSSStyleDeclaration, CSSStyleRule, CSSStyleSheet, Document, HTMLElement, HTMLLinkElement, HTMLStyleElement, StyleSheet, StyleSheetList
CSS.escape() css-escape	Widely available	Partial 90%	90%	90%	9 / 10
CSS.supports() css-supports	Widely available	Partial 99%	99%	99%	1549 / 1558
cubic-bezier() easing cubic-bezier-easing	Widely available	Full	100%	100%	4 / 4	manual 5
currentColor currentcolor	Widely available	Full	100%	100%	1 / 1	needs-reftests 11
Custom properties custom-properties	Widely available	Partial 73%	73%	73%	433 / 590	needs-reftests 183, other 4
Data URLs data-urls	Widely available	Partial 95%	95%	95%	316 / 330	worker-variant 4
Dataset dataset	Widely available	Partial 98%	98%	98%	73 / 74		DOMStringMap, HTMLElement, SVGElement
Date date	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Date and time <input> types input-date-time	Widely available	Partial 35%	35%	35%	55 / 155	needs-reftests 8, other 1
Declarative shadow DOM declarative-shadow-dom	Widely available	Partial 1.4%	1.4%	1.4%	112 / 7738	tentative 36, other 1
Dedicated workers dedicated-workers	Widely available	Partial 85%	85%	85%	410 / 477	worker-variant 8	DedicatedWorkerGlobalScope, Worker, WorkerGlobalScope, WorkerLocation
Description list description-list	Widely available	Full	100%	100%	3 / 3		HTMLDListElement
Destructuring destructuring	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Device orientation events device-orientation-events	Widely available	Partial 11%	11%	11%	16 / 139	manual 10
dir dir	Widely available	No WPT tests			0 / 0		HTMLElement
dirname dirname	Widely available	Partial 10%	10%	10%	1 / 10	manual 1
Display display	Widely available	Partial 65%	65%	65%	246 / 376	needs-reftests 11, other 1
display: flow-root display-flow-root	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 4
display: list-item display-list-item	Widely available	Full	100%	100%	1 / 1	needs-reftests 1
display: table display-table	Widely available	Partial 71%	71%	71%	435 / 608	needs-reftests 169, other 42, tentative 23
document.elementFromPoint() and document.elementsFromPoint() element-from-point	Widely available	Partial 47%	47%	52%	47 / 100	other 1	Document
DOM dom	Widely available	No WPT tests			0 / 0		Attr, CDATASection, CharacterData, Comment, DOMImplementation, DOMStringList, DOMTokenList, Document, DocumentFragment, DocumentType, Element, HTMLCollection, HTMLElement, NamedNodeMap, Node, NodeIterator, NodeList, ProcessingInstruction, Text, TreeWalker, Window, XMLDocument
DOM Geometry dom-geometry	Widely available	Partial 96%	96%	96%	1515 / 1575		DOMRect
dominant-baseline dominant-baseline	Widely available	Partial 3.8%	3.8%	3.8%	4 / 104	needs-reftests 8
DOMParser domparser	Widely available	Partial 34%	34%	34%	112 / 326
download download	Widely available	Not yet	0.0%	0.0%	0 / 4	not-html 1	HTMLAnchorElement, HTMLAreaElement
Drag and Drop draganddrop	Widely available	Partial 10%	10%	10%	63 / 630	manual 184, not-html 11, other 1	HTMLElement
dynamic-range media query dynamic-range	Widely available	Partial 30%	30%	30%	7 / 23
em unit em-unit	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 8
Email, telephone, and URL <input> types input-email-tel-url	Widely available	Partial 60%	60%	60%	18 / 30
Encrypted media extensions encrypted-media-extensions	Widely available	Not yet	0.0%	0.0%	0 / 267
enterkeyhint enterkeyhint	Widely available	No WPT tests			0 / 0
Error cause error-cause	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Events events	Widely available	Partial 66%	66%	66%	669 / 1009	other 2	CustomEvent, Event, EventTarget
ex unit ex	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 6
Exception handling (WebAssembly) wasm-exception-handling	Widely available	Partial 57%	57%	57%	73 / 127	worker-variant 11
Exponential functions (CSS) exp-functions	Widely available	Partial 93%	93%	93%	306 / 327
Exponentiation operator exponentiation	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
EXT_blend_minmax WebGL extension ext-blend-minmax	Widely available	No WPT tests			0 / 0
EXT_color_buffer_float WebGL extension ext-color-buffer-float	Widely available	No WPT tests			0 / 0
EXT_color_buffer_half_float WebGL extension ext-color-buffer-half-float	Widely available	No WPT tests			0 / 0
EXT_shader_texture_lod WebGL extension ext-shader-texture-lod	Widely available	No WPT tests			0 / 0
EXT_sRGB WebGL extension ext-srgb	Widely available	No WPT tests			0 / 0
EXT_texture_filter_anisotropic WebGL extension ext-texture-filter-anisotropic	Widely available	No WPT tests			0 / 0
Extended constant expressions (WebAssembly) wasm-extended-constant-expressions	Widely available	No WPT tests			0 / 0
Fetch fetch	Widely available	Partial 76%	76%	76%	4284 / 5633	worker-variant 213, tentative 18, needs-reftests 11, other 4
File API file	Widely available	Partial 81%	81%	81%	1267 / 1552	manual 11, worker-variant 4, other 2, needs-reftests 1
filter filter	Widely available	Partial 85%	85%	85%	991 / 1159	needs-reftests 102, other 1
fit-content fit-content	Widely available	Full	100%	100%	4 / 4	needs-reftests 14
Fixed positioning fixed-positioning	Widely available	Full	100%	100%	1 / 1	needs-reftests 10, manual 4, other 2
Fixed-width SIMD (WebAssembly) wasm-simd	Widely available	Partial 4.0%	4.0%	4.0%	4043 / 100811
Flexbox flexbox	Widely available	Partial 71%	71%	71%	3448 / 4813	needs-reftests 1023, other 45, manual 21
Flexbox gap flexbox-gap	Widely available	Partial 66%	66%	66%	2 / 3	needs-reftests 47
float and clear float-clear	Widely available	Full	100%	100%	31 / 31	needs-reftests 38, other 2
Focus events focus-events	Widely available	Partial 35%	35%	35%	7 / 20	not-html 3, manual 1	HTMLElement
Font loading font-loading	Widely available	Not yet	0.0%	0.0%	0 / 76	needs-reftests 7, other 4
Font shorthand font-shorthand	Widely available	Partial 99%	99%	99%	545 / 549	other 41, needs-reftests 16
font-display font-display	Widely available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 4
font-family font-family	Widely available	Full	100%	100%	36 / 36	needs-reftests 29, other 26
font-feature-settings font-feature-settings	Widely available	Partial 40%	40%	40%	25 / 61	needs-reftests 6, other 1
font-kerning font-kerning	Widely available	Partial 15%	15%	15%	8 / 51	needs-reftests 6
font-optical-sizing font-optical-sizing	Widely available	Full	100%	100%	6 / 6	needs-reftests 2
font-palette font-palette	Widely available	Partial 6.2%	6.2%	6.2%	5 / 80	needs-reftests 51, other 1
font-size font-size	Widely available	Partial 97%	97%	97%	301 / 310	other 61, needs-reftests 60
font-stretch font-stretch	Widely available	Partial 87%	87%	87%	283 / 323	needs-reftests 18
font-style font-style	Widely available	Partial 81%	81%	81%	163 / 201	needs-reftests 21, other 8
font-synthesis font-synthesis	Widely available	Partial 21%	21%	21%	12 / 56	needs-reftests 8
font-synthesis-small-caps font-synthesis-small-caps	Widely available	Partial 50%	50%	50%	2 / 4	needs-reftests 4
font-synthesis-style font-synthesis-style	Widely available	Partial 57%	57%	57%	4 / 7	needs-reftests 5
font-synthesis-weight font-synthesis-weight	Widely available	Full	100%	100%	4 / 4	needs-reftests 5
font-variant font-variant	Widely available	Partial 86%	86%	86%	68 / 79	needs-reftests 4
font-variant-alternates font-variant-alternates	Widely available	Full	100%	100%	19 / 19	needs-reftests 21
font-variant-caps font-variant-caps	Widely available	Partial 11%	11%	11%	6 / 54	needs-reftests 8
font-variant-east-asian font-variant-east-asian	Widely available	Partial 43%	43%	43%	33 / 76	needs-reftests 10
font-variant-ligatures font-variant-ligatures	Widely available	Partial 37%	37%	37%	26 / 69	needs-reftests 11, other 1
font-variant-numeric font-variant-numeric	Widely available	Partial 42%	42%	42%	31 / 73	needs-reftests 9
font-variation-settings font-variation-settings	Widely available	Partial 93%	93%	93%	465 / 498	needs-reftests 4
font-weight font-weight	Widely available	Partial 91%	91%	91%	21 / 23	needs-reftests 24, other 15
Forced colors forced-colors	Widely available	Partial 56%	56%	56%	64 / 113	needs-reftests 45
Form validity pseudo-classes form-validity-pseudos	Widely available	Partial 6.1%	6.1%	6.1%	3 / 49	needs-reftests 3
Form-associated custom elements form-associated-custom-elements	Widely available	Partial 2.4%	2.4%	2.4%	3 / 123	needs-reftests 2	ElementInternals, HTMLElement
Functions functions	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Gamepad gamepad	Widely available	Partial 35%	35%	35%	41 / 116	manual 5
Generators generators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Geolocation API geolocation	Widely available	Partial 20%	20%	20%	27 / 132
getComputedStyle() get-computed-style	Widely available	Partial 31%	31%	31%	29 / 91	other 5	Window
GIF gif	Widely available	No WPT tests			0 / 0
globalThis globalthis	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Gradients gradients	Widely available	Full	100%	100%	243 / 243	needs-reftests 58, other 3
Grid grid	Widely available	Partial 19%	19%	19%	1774 / 9247	needs-reftests 727, other 21
Grid animation grid-animation	Widely available	Full	100%	100%	2092 / 2092	needs-reftests 2
hardwareConcurrency hardware-concurrency	Widely available	Full	100%	100%	1 / 1	worker-variant 2
Hashbang comments hashbang-comments	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
hashchange hashchange	Widely available	Partial 47%	47%	47%	10 / 21		HashChangeEvent, Window
History history	Widely available	Partial 18%	18%	18%	55 / 304		History, PopStateEvent, Window
Host host	Widely available	Partial 2.9%	2.9%	2.9%	2 / 67	needs-reftests 33
HSL hsl	Widely available	Partial 99.5%	99.5%	99.5%	3820 / 3836	needs-reftests 47
HTTP authentication http-authentication	Widely available	Full	100%	100%	33 / 33	worker-variant 4, manual 3, needs-reftests 1
HTTP Strict Transport Security hsts	Widely available	Not yet	0.0%	0.0%	0 / 1
HTTP/1.1 http11	Widely available	No WPT tests			0 / 0
HTTP/2 http2	Widely available	Partial 14%	14%	14%	3 / 21
HWB hwb	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 5
Hyphenate character hyphenate-character	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 5
Hyphenation hyphens	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 38, other 2
ic unit ic	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 13
Image maps image-maps	Widely available	Partial 13%	13%	13%	38 / 272	other 1, manual 1	HTMLAreaElement, HTMLMapElement
image-orientation image-orientation	Widely available	Partial 66%	66%	66%	12 / 18	needs-reftests 37, other 1
image-rendering image-rendering	Widely available	Partial 66%	66%	66%	8 / 12	needs-reftests 2
image-set() image-set	Widely available	Full	100%	100%	180 / 180	needs-reftests 37
ImageBitmapRenderingContext imagebitmaprenderingcontext	Widely available	Partial 5.0%	5.0%	5.0%	1 / 20
Imperative slot assignment slot-assign	Widely available	Partial 2.7%	2.7%	2.7%	1 / 36	other 2, needs-reftests 1
Import and export of mutable globals (WebAssembly) wasm-mutable-globals	Widely available	Not yet	0.0%	0.0%	0 / 14	worker-variant 2
Import maps import-maps	Widely available	Partial 2.7%	2.7%	2.7%	11 / 394
IndexedDB indexeddb	Widely available	Partial 95%	95%	95%	2929 / 3061	worker-variant 366	IDBCursor, IDBCursorWithValue, IDBDatabase, IDBFactory, IDBIndex, IDBKeyRange, IDBObjectStore, IDBOpenDBRequest, IDBRequest, IDBTransaction, IDBVersionChangeEvent
Individual transform properties individual-transforms	Widely available	Full	100%	100%	47 / 47	needs-reftests 23
inert inert	Widely available	Partial 17%	17%	17%	20 / 113
inherit inherit-value	Widely available	Full	100%	100%	4 / 4	other 5, needs-reftests 2
initial initial-value	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
Inline-size containment contain-inline-size	Widely available	Partial 6.6%	6.6%	6.6%	2 / 30	needs-reftests 16
input (event) input-event	Widely available	No WPT tests			0 / 0		InputEvent
Input selectors input-selectors	Widely available	Partial 33%	33%	33%	6 / 18	not-html 3, manual 1
inputmode inputmode	Widely available	No WPT tests			0 / 0
Interaction media queries interaction	Widely available	No WPT tests			0 / 0
Intersection observer intersection-observer	Widely available	Partial 2.0%	2.0%	2.0%	5 / 240	other 3, needs-reftests 1
Intl intl	Widely available	Partial 87%	87%	87%	1120 / 1276
Intl.DisplayNames intl-display-names	Widely available	Partial 98%	98%	98%	112 / 114
Intl.ListFormat intl-list-format	Widely available	Partial 98%	98%	98%	160 / 162
Intl.Locale intl-locale	Widely available	Partial 63%	63%	63%	242 / 380
Intl.PluralRules intl-plural-rules	Widely available	Partial 96%	96%	96%	102 / 106
Intl.RelativeTimeFormat intl-relative-time-format	Widely available	Partial 98%	98%	98%	158 / 160
Intl.Segmenter intl-segmenter	Widely available	Partial 94%	94%	94%	150 / 158
isolation isolation	Widely available	Full	100%	100%	48 / 48	other 1, needs-reftests 1
isSecureContext is-secure-context	Widely available	Partial 21%	21%	21%	12 / 55	worker-variant 4
Iterators and the for...of loop iterators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
JavaScript (initial core language support) javascript	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
JavaScript modules js-modules	Widely available	Partial 16%	16%	16%	63 / 390	worker-variant 18, manual 2, needs-reftests 1, not-html 1
JavaScript modules in workers js-modules-workers	Widely available	Partial 57%	57%	57%	81 / 141
JPEG jpeg	Widely available	No WPT tests			0 / 0
JSON json	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Keyboard events keyboard-events	Widely available	Partial 7.7%	7.7%	7.7%	29 / 372	manual 2	KeyboardEvent
Lab and LCH lab	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 22
lang lang-attr	Widely available	Not yet	0.0%	0.0%	0 / 19	needs-reftests 4	HTMLElement
Language language	Widely available	Full	100%	100%	2 / 2	manual 1	Window, WorkerGlobalScope
Layout containment contain-layout	Widely available	Not yet	0.0%	0.0%	0 / 4	needs-reftests 73
Layout direction override layout-direction-override	Widely available	Partial 64%	64%	64%	150 / 234	needs-reftests 191, other 53
Lazy-loading images and iframes loading-lazy	Widely available	Partial 10%	10%	10%	10 / 96	needs-reftests 6, other 2
Let and const let-const	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
letter-spacing letter-spacing	Widely available	Full	100%	100%	201 / 201	needs-reftests 97
lh unit lh	Widely available	Partial 44%	44%	44%	8 / 18	needs-reftests 4
line-break line-break	Widely available	Partial 1.4%	1.4%	1.4%	16 / 1120	needs-reftests 89
line-height line-height	Widely available	Partial 99.5%	99.5%	99.5%	656 / 659	needs-reftests 81, other 26
linear() easing linear-easing	Widely available	Partial 76%	76%	76%	39 / 51	other 2
Link selectors link-selectors	Widely available	Full	100%	100%	1 / 1	needs-reftests 9, manual 7, other 1
List style list-style	Widely available	Partial 98%	98%	98%	4068 / 4142	needs-reftests 88, other 80
localStorage and sessionStorage localstorage	Widely available	Partial 95%	95%	95%	1239 / 1291	manual 2	Storage, StorageEvent, Window
Location location	Widely available	Partial 11%	11%	11%	33 / 287	manual 5	Document, Location, Window
Locks web-locks	Widely available	Partial 12%	12%	12%	36 / 294	worker-variant 30, other 5
Logical assignments logical-assignments	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Logical properties logical-properties	Widely available	Partial 63%	63%	63%	873 / 1366	needs-reftests 6
Map (initial support) map	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
margin margin	Widely available	Partial 99%	99%	99%	138 / 139	needs-reftests 391, other 51, manual 1
mask-type mask-type	Widely available	Full	100%	100%	7 / 7	needs-reftests 3
Masks masks	Widely available	Partial 99%	99%	99%	799 / 806	needs-reftests 119, other 1
matchMedia matchmedia	Widely available	Partial 40%	40%	40%	43 / 106		MediaQueryList, MediaQueryListEvent, Window
Math and numbers number	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
MathML mathml	Widely available	Partial 4.2%	4.2%	3.7%	191 / 4469	needs-reftests 294, other 127
Media capabilities media-capabilities	Widely available	Partial 12%	12%	12%	44 / 351
Media capture media-capture	Widely available	Partial 5.6%	5.6%	5.6%	22 / 389	manual 1
Media playback quality media-playback-quality	Widely available	Partial 36%	36%	36%	11 / 30
Media queries media-queries	Widely available	Partial 57%	57%	57%	36 / 63	needs-reftests 38, other 4
Media query range syntax media-query-range-syntax	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 3
MediaStream recording mediastream-recording	Widely available	Partial 0.6%	0.6%	0.6%	3 / 464
messageerror messageerror	Widely available	Partial 75%	75%	75%	3 / 4		DedicatedWorkerGlobalScope, MessagePort, Window, Worker
Meta refresh meta-refresh	Widely available	No WPT tests			0 / 0
Min and max width and height min-max-width-height	Widely available	Partial 60%	60%	60%	3 / 5	needs-reftests 1
min-content and max-content min-max-content	Widely available	Partial 10%	10%	10%	45 / 449	needs-reftests 55
min(), max(), and clamp() min-max-clamp	Widely available	Full	100%	100%	873 / 873	needs-reftests 7, other 1
mix-blend-mode mix-blend-mode	Widely available	Partial 98%	98%	98%	52 / 53	needs-reftests 51, other 5
Mixed content handling mixed-content	Widely available	Partial 29%	29%	29%	561 / 1908	worker-variant 66, tentative 4
Motion path motion-path	Widely available	Partial 62%	62%	62%	3119 / 4959	needs-reftests 98, other 4
Mouse events mouse-events	Widely available	Partial 71%	71%	71%	217 / 302	manual 2, other 1	HTMLElement, MouseEvent, UIEvent
Multi-column layout multi-column	Widely available	Partial 19%	19%	19%	15 / 76	needs-reftests 174, other 15, manual 1
Multi-value (WebAssembly) wasm-multi-value	Widely available	Full	100%	100%	6 / 6	worker-variant 1
MutationObserver mutationobserver	Widely available	Partial 84%	84%	84%	138 / 164	other 1, not-html 1	MutationObserver, MutationRecord
Named colors named-color	Widely available	Full	100%	100%	639 / 639	needs-reftests 1
Navigation timing performance entries navigation-timing	Widely available	Partial 9.5%	9.5%	9.5%	44 / 462
Navigator navigator	Widely available	No WPT tests			0 / 0
Nesting nesting	Widely available	Partial 84%	84%	84%	123 / 145	needs-reftests 17, other 6
Non-trapping float-to-int conversion (WebAssembly) wasm-non-trapping-float-to-int	Widely available	No WPT tests			0 / 0
Notifications from service workers and installed apps notifications-apps	Widely available	Not yet	0.0%	0.0%	0 / 20	manual 1
Nullish coalescing nullish-coalescing	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Numeric separators numeric-separators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Object object-object	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
object-fit object-fit	Widely available	Partial 57%	57%	57%	15 / 26	needs-reftests 132, other 2
object-position object-position	Widely available	Full	100%	100%	215 / 215	needs-reftests 18
Object.hasOwn() object-hasown	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
OES_draw_buffers_indexed WebGL extension webgl-oes-draw-buffers-indexed	Widely available	No WPT tests			0 / 0
OES_element_index_uint WebGL extension oes-element-index-uint	Widely available	No WPT tests			0 / 0
OES_fbo_render_mipmap WebGL extension oes-fbo-render-mipmap	Widely available	No WPT tests			0 / 0
OES_standard_derivatives WebGL extension oes-standard-derivatives	Widely available	No WPT tests			0 / 0
OES_texture_float WebGL extension oes-texture-float	Widely available	No WPT tests			0 / 0
OES_texture_float_linear WebGL extension oes-texture-float-linear	Widely available	No WPT tests			0 / 0
OES_texture_half_float WebGL extension oes-texture-half-float	Widely available	No WPT tests			0 / 0
OES_texture_half_float_linear WebGL extension oes-texture-half-float-linear	Widely available	No WPT tests			0 / 0
OES_vertex_array_object WebGL extension oes-vertex-array-object	Widely available	No WPT tests			0 / 0
OfflineAudioContext offline-audio-context	Widely available	Partial 17%	17%	17%	11 / 63
Offscreen canvas offscreen-canvas	Widely available	Partial 69%	69%	69%	1069 / 1545	needs-reftests 253, manual 14, other 4	OffscreenCanvas, OffscreenCanvasRenderingContext2D
Oklab and OkLCh oklab	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 28
Online status online	Widely available	Not yet	0.0%	0.0%	0 / 3	manual 1	Window, WorkerGlobalScope
opacity opacity	Widely available	Partial 85%	85%	85%	183 / 214	needs-reftests 12
Opacity (SVG) opacity-svg	Widely available	Not yet	0.0%	0.0%	0 / 62	not-html 6, manual 2, needs-reftests 1
Optional catch binding optional-catch-binding	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Origin private file system origin-private-file-system	Widely available	Not yet	0.0%	0.0%	0 / 8	worker-variant 2
outline outline	Widely available	Full	100%	100%	4 / 4	needs-reftests 34, other 1
Outlines outlines	Widely available	Partial 99%	99%	99%	561 / 566	other 86, needs-reftests 53
overflow overflow-shorthand	Widely available	Partial 70%	70%	70%	21 / 30	needs-reftests 36, other 20
Overflow media queries overflow	Widely available	Partial 39%	39%	39%	11 / 28
overflow-wrap overflow-wrap	Widely available	Partial 37%	37%	37%	28 / 74	needs-reftests 49, other 3
overflow: clip overflow-clip	Widely available	Partial 71%	71%	71%	5 / 7	needs-reftests 16, other 2
padding padding	Widely available	Full	100%	100%	54 / 54	needs-reftests 342, other 13
Page breaks page-breaks	Widely available	Not run its tests are manual			0 / 0	manual 2
Page transition events page-transition-events	Widely available	No WPT tests			0 / 0		Window
Page visibility page-visibility	Widely available	Partial 48%	48%	48%	18 / 37	manual 2	Document
Paint containment contain-paint	Widely available	Partial 20%	20%	20%	1 / 5	needs-reftests 80
Paint timing performance entries paint-timing	Widely available	Partial 5.1%	5.1%	5.1%	4 / 77
paint-order paint-order	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 5, not-html 4
pdfViewerEnabled pdf-viewer	Widely available	Not yet	0.0%	0.0%	0 / 3
Performance performance	Widely available	Partial 54%	54%	54%	603 / 1107	worker-variant 6, manual 1	Performance, PerformanceEntry, PerformanceMark, PerformanceMeasure
Permissions permissions	Widely available	Partial 46%	46%	46%	79 / 170	worker-variant 2
Physical properties physical-properties	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 200
PNG png	Widely available	Partial 25%	25%	25%	1 / 4	needs-reftests 61, manual 8
Pointer Events pointer-events-api	Widely available	Partial 19%	19%	19%	484 / 2436	manual 7, other 1	Element, PointerEvent
pointer-events pointer-events	Widely available	Not yet	0.0%	0.0%	0 / 41	manual 12
Position position	Widely available	Full	100%	100%	109 / 109
postMessage postmessage	Widely available	Partial 70%	70%	70%	309 / 441	worker-variant 3	DedicatedWorkerGlobalScope, MessageEvent, Window, Worker
prefers-color-scheme media query prefers-color-scheme	Widely available	Partial 44%	44%	44%	8 / 18	needs-reftests 5
prefers-contrast media query prefers-contrast	Widely available	Partial 38%	38%	38%	10 / 26
prefers-reduced-motion media query prefers-reduced-motion	Widely available	Partial 20%	20%	20%	6 / 29
Preloading responsive images preloading-responsive-images	Widely available	Not yet	0.0%	0.0%	0 / 2
preservesPitch preserves-pitch	Widely available	Not yet	0.0%	0.0%	0 / 9
Print events print-events	Widely available	Not run its tests are manual			0 / 0	manual 1	Window
Promise (initial support) promise	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Promise finally() promise-finally	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Promise.allSettled() promise-allsettled	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Promise.any() promise-any	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Promise.withResolvers() promise-withresolvers	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Proxy and Reflect proxy-reflect	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Push messages push	Widely available	Partial 28%	28%	28%	37 / 129	worker-variant 6
Q unit q-unit	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2
queueMicrotask() queuemicrotask	Widely available	Partial 93%	93%	93%	14 / 15	worker-variant 4
Quotes quotes	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 44
rect() and xywh() rect-xywh	Widely available	Partial 75%	75%	75%	42 / 56
Reference types (WebAssembly) wasm-reference-types	Widely available	Partial 53%	53%	53%	97 / 180
Referrer policy referrer-policy	Widely available	Partial 29%	29%	18%	2481 / 8431	worker-variant 192, needs-reftests 1
Regular expressions regexp	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Relative positioning relative-positioning	Widely available	Partial 91%	91%	91%	41 / 45	needs-reftests 71, manual 5, other 2
rem rem	Widely available	Full	100%	100%	4 / 4	needs-reftests 1
requestAnimationFrame() request-animation-frame	Widely available	Partial 93%	93%	93%	15 / 16	manual 1	Window
requestAnimationFrame() in workers request-animation-frame-workers	Widely available	Not yet	0.0%	0.0%	0 / 1
Resize observer resize-observer	Widely available	Partial 53%	53%	53%	68 / 127	needs-reftests 3, other 1, not-html 1	ResizeObserver, ResizeObserverEntry, ResizeObserverSize
resolution media query resolution	Widely available	No WPT tests			0 / 0
resolution media query (compatibility prefixes) resolution-compat	Widely available	No WPT tests			0 / 0
Resource size resource-size	Widely available	Not yet	0.0%	0.0%	0 / 5
Resource timing performance entries resource-timing	Widely available	Partial 2.0%	2.0%	2.0%	23 / 1110	worker-variant 7
revert revert-value	Widely available	Partial 83%	83%	83%	10 / 12	needs-reftests 2
RGB rgb	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 24
rlh unit rlh	Widely available	Partial 50%	50%	50%	1 / 2	needs-reftests 1
Safe area inset environment variables safe-area-inset	Widely available	Partial 66%	66%	66%	10 / 15
Sandboxed iframes iframe-sandbox	Widely available	Partial 4.1%	4.1%	4.1%	5 / 121	manual 8, other 2, needs-reftests 2
Screen screen	Widely available	Full	100%	100%	16 / 16		Screen
Screen orientation screen-orientation	Widely available	Partial 7.6%	7.6%	7.6%	4 / 52	manual 1
scripting media query scripting	Widely available	Partial 25%	25%	25%	3 / 12	needs-reftests 2
Scroll methods on elements scroll-elements	Widely available	Partial 49%	49%	49%	340 / 689	needs-reftests 2, not-html 2	Document, Element, Window
Scroll snap scroll-snap	Widely available	Partial 19%	19%	19%	150 / 763	needs-reftests 26, other 2
scroll-behavior scroll-behavior	Widely available	Partial 23%	23%	23%	52 / 217
scrollIntoView() scroll-into-view	Widely available	Not yet	0.0%	0.0%	0 / 163	other 1, needs-reftests 1
Selection selection-api	Widely available	Partial 0.1%	0.1%	0.1%	60 / 34017	other 37, needs-reftests 19, manual 1	Document
Selectors (core) selectors	Widely available	Partial 40%	40%	40%	845 / 2066	not-html 111, needs-reftests 90, other 9, manual 5
Server timing server-timing	Widely available	Partial 3.2%	3.2%	3.2%	15 / 460
Server-sent events server-sent-events	Widely available	Not yet	0.0%	0.0%	0 / 141	worker-variant 11
Service workers service-workers	Widely available	Partial 3.3%	3.3%	3.3%	76 / 2280	worker-variant 30, manual 5, tentative 5, other 3, needs-reftests 1
Set (initial support) set	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
setInterval setinterval	Widely available	Partial 93%	93%	93%	15 / 16
setTimeout() settimeout	Widely available	Partial 90%	90%	90%	10 / 11
Shadow DOM shadow-dom	Widely available	Partial 3.4%	3.4%	3.4%	26 / 756	other 40, needs-reftests 18, tentative 5, not-html 2	Event, Node, ShadowRoot
Shadow parts shadow-parts	Widely available	Partial 1.2%	1.2%	1.2%	3 / 235	needs-reftests 8
shape-outside shape-outside	Widely available	Partial 6.1%	6.1%	6.1%	438 / 7167	needs-reftests 237, other 5
shapes shapes	Widely available	Partial 41%	41%	41%	62 / 151	needs-reftests 1
SharedArrayBuffer and Atomics shared-memory	Widely available	No WPT tests			0 / 0
Sign extension operators (WebAssembly) wasm-sign-extension-operators	Widely available	No WPT tests			0 / 0
Size containment contain-size	Widely available	Partial 73%	73%	73%	79 / 108	needs-reftests 91
Small, large, and dynamic viewport units viewport-unit-variants	Widely available	Partial 17%	17%	17%	24 / 140	needs-reftests 1
SMIL SVG animations smil-svg-animations	Widely available	Partial 1.5%	1.5%	1.5%	5 / 331	needs-reftests 21, not-html 14, other 10
Sourcemap header sourcemap-header	Widely available	Excluded a header only developer tools read; it comes back when niso has devtools			0 / 0
Speech synthesis speech-synthesis	Widely available	Not yet	0.0%	0.0%	0 / 30	manual 1
spellcheck spellcheck	Widely available	Not yet	0.0%	0.0%	0 / 4	needs-reftests 10
Spread syntax spread	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
srcdoc iframe-srcdoc	Widely available	Not yet	0.0%	0.0%	0 / 29	other 1	HTMLIFrameElement
srcset and sizes srcset	Widely available	Partial 0.1%	0.1%	0.1%	2 / 1220	needs-reftests 5
Stable array sort stable-array-sort	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Static positioning static-positioning	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 2, other 1
steps() easing steps-easing	Widely available	Partial 86%	86%	86%	70 / 81	manual 3, needs-reftests 1
Sticky positioning sticky-positioning	Widely available	Partial 21%	21%	21%	18 / 82	needs-reftests 76, other 7
Storage access storage-access	Widely available	Partial 8.8%	8.8%	8.8%	8 / 90	worker-variant 1
Storage manager storage-manager	Widely available	Partial 33%	33%	33%	34 / 103	manual 1
Streams streams	Widely available	Partial 1.9%	1.9%	1.9%	42 / 2116	worker-variant 108, other 5
String (initial support) strings	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String at() string-at	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String codePointAt() and fromCodePoint() string-codepoint	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String includes() string-includes	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String isWellFormed() and toWellFormed() string-wellformed	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String matchAll() string-matchall	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String normalize() string-normalize	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String padStart() and padEnd() string-pad	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String raw() string-raw	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String repeat() string-repeat	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String replaceAll() string-replaceall	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String startsWith() and endsWith() string-startsends-with	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
String trimStart() and trimEnd() string-trim-startend	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
structuredClone() structured-clone	Widely available	Partial 92%	92%	92%	270 / 293	other 1
style (attribute) style-attr	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 17
Style containment contain-style	Widely available	Not yet	0.0%	0.0%	0 / 4	needs-reftests 42, other 1
Subgrid subgrid	Widely available	Partial 22%	22%	22%	57 / 256	needs-reftests 102, other 14
Subresource integrity subresource-integrity	Widely available	No WPT tests			0 / 0		HTMLLinkElement, HTMLScriptElement
SVG svg	Widely available	Partial 4.3%	4.3%	4.3%	18 / 413	manual 456, needs-reftests 79, not-html 7	SVGElement
SVG filters svg-filters	Widely available	Not yet	0.0%	0.0%	0 / 2	manual 43, needs-reftests 4, other 2
Symbol symbol	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
System colors system-color	Widely available	Partial 62%	62%	62%	80 / 129	needs-reftests 25, other 1
System font font-family-system	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 8
tab-size tab-size	Widely available	Partial 98%	98%	98%	238 / 241	needs-reftests 16
tabindex tabindex	Widely available	Partial 26%	26%	26%	44 / 169		HTMLElement
Tables table	Widely available	Partial 82%	82%	82%	135 / 163		HTMLTableCaptionElement, HTMLTableCellElement, HTMLTableColElement, HTMLTableElement, HTMLTableRowElement, HTMLTableSectionElement
Template literals template-literals	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Text encoding and decoding text-encoding	Widely available	Partial 2.0%	2.0%	2.0%	23593 / 1151764	worker-variant 32, needs-reftests 4, other 2	TextDecoder, TextEncoder
Text overflow text-overflow	Widely available	Partial 30%	30%	30%	17 / 56	needs-reftests 92, other 2, manual 2
Text stroke and fill (compatibility prefixes) text-stroke-fill	Widely available	Full	100%	100%	1 / 1	needs-reftests 11
Text tracks text-tracks	Widely available	Partial 2.2%	2.2%	2.2%	5 / 220	needs-reftests 4	HTMLTrackElement
text-align text-align	Widely available	Partial 76%	76%	76%	26 / 34	needs-reftests 66, other 42
text-align-last text-align-last	Widely available	Partial 76%	76%	76%	146 / 190	needs-reftests 33, other 12
text-combine-upright text-combine-upright	Widely available	Partial 3.3%	3.3%	3.3%	2 / 59	needs-reftests 36, manual 5, other 1
text-decoration text-decoration	Widely available	Partial 91%	91%	91%	526 / 576	needs-reftests 162, manual 56, other 43
text-decoration-skip-ink text-decoration-skip-ink	Widely available	No WPT tests			0 / 0
text-emphasis text-emphasis	Widely available	Partial 13%	13%	13%	6 / 43	needs-reftests 137
text-indent text-indent	Widely available	Full	100%	100%	1 / 1	needs-reftests 25, other 2
text-orientation text-orientation	Widely available	Partial 78%	78%	78%	18 / 23	needs-reftests 13, other 9
text-shadow text-shadow	Widely available	Full	100%	100%	253 / 253	needs-reftests 38
text-transform text-transform	Widely available	Partial 20%	20%	20%	48 / 233	needs-reftests 158, other 1, manual 1
text-underline-offset text-underline-offset	Widely available	Full	100%	100%	356 / 356	needs-reftests 14, manual 1
text-underline-position text-underline-position	Widely available	Full	100%	100%	22 / 22	manual 10, needs-reftests 8, other 7
Threads and atomics (WebAssembly) wasm-threads	Widely available	Not yet	0.0%	0.0%	0 / 14	worker-variant 3
title (attribute) title-attr	Widely available	Not run its tests are manual			0 / 0	manual 1	HTMLElement
touch-action touch-action	Widely available	Partial 28%	28%	29%	30 / 104	manual 1
Transferable ArrayBuffer transferable-arraybuffer	Widely available	No WPT tests			0 / 0
transform-box transform-box	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 34
Transitions (CSS) transitions	Widely available	Partial 50%	50%	50%	1316 / 2589	manual 48, other 12, needs-reftests 6
translate translate	Widely available	Not yet	0.0%	0.0%	0 / 12
Trigonometric functions (CSS) trig-functions	Widely available	Full	100%	100%	521 / 521
Two-value display property two-value-display	Widely available	Partial 65%	65%	65%	179 / 275	tentative 2
Typed array iteration methods typed-array-iteration-methods	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Typed array iterators typed-array-iterators	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Typed arrays (initial support) typed-arrays	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Unicode point escapes unicode-point-escapes	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
unset unset-value	Widely available	Full	100%	100%	1 / 1	needs-reftests 11
Update frequency media query update	Widely available	Partial 35%	35%	35%	5 / 14
Upgrade insecure requests upgrade-insecure-requests	Widely available	Partial 15%	15%	15%	120 / 762	worker-variant 52
URL url	Widely available	Partial 85%	85%	85%	9429 / 10977	not-html 2	URL, URLSearchParams
URL.canParse() url-canparse	Widely available	Full	100%	100%	16 / 16
User action pseudo-classes user-action-pseudos	Widely available	Not yet	0.0%	0.0%	0 / 4	manual 12, needs-reftests 1
User activation user-activation	Widely available	Partial 15%	15%	15%	10 / 63
User agent sniffing user-agent-sniffing	Widely available	Partial 42%	42%	42%	11 / 26
vertical-align vertical-align	Widely available	Partial 65%	65%	65%	54 / 82	needs-reftests 80, other 14
Viewport units viewport-units	Widely available	Partial 43%	43%	43%	154 / 351	needs-reftests 21, other 1
visibility visibility	Widely available	Full	100%	100%	8 / 8	other 20, needs-reftests 4, manual 1
Visual viewport API visual-viewport	Widely available	Not yet	0.0%	0.0%	0 / 35	manual 10
Weak references weak-references	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
WeakMap weakmap	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
WeakSet weakset	Widely available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Web animations web-animations	Widely available	Partial 91%	91%	91%	3301 / 3589	other 45, needs-reftests 18	Animation, AnimationEffect, AnimationPlaybackEvent, AnimationTimeline, Document, DocumentTimeline, Element, KeyframeEffect
Web Audio web-audio	Widely available	Partial 33%	33%	33%	649 / 1966	other 7
Web authentication webauthn	Widely available	Partial 16%	16%	16%	69 / 419	manual 1
Web authentication easy public key access webauthn-public-key-easy	Widely available	Not yet	0.0%	0.0%	0 / 2
Web Cryptography web-cryptography	Widely available	Partial 74%	74%	74%	52549 / 70571	worker-variant 1	Crypto
WebAssembly wasm	Widely available	Partial 91%	91%	91%	2490 / 2709	worker-variant 62
WebGL webgl	Widely available	Partial 0.2%	0.2%	0.2%	9 / 4273	needs-reftests 2, other 1
WEBGL_color_buffer_float WebGL extension webgl-color-buffer-float	Widely available	No WPT tests			0 / 0
WEBGL_compressed_texture_astc WebGL extension webgl-compressed-texture-astc	Widely available	No WPT tests			0 / 0
WEBGL_compressed_texture_etc WebGL extension webgl-compressed-texture-etc	Widely available	No WPT tests			0 / 0
WEBGL_compressed_texture_etc1 WebGL extension webgl-compressed-texture-etc1	Widely available	No WPT tests			0 / 0
WEBGL_debug_renderer_info WebGL extension webgl-debug-renderer-info	Widely available	No WPT tests			0 / 0
WEBGL_debug_shaders WebGL extension webgl-debug-shaders	Widely available	No WPT tests			0 / 0
WEBGL_depth_texture WebGL extension webgl-depth-texture	Widely available	No WPT tests			0 / 0
WEBGL_lose_context WebGL extension webgl-lose-context	Widely available	No WPT tests			0 / 0
WebGL2 webgl2	Widely available	No WPT tests			0 / 0
WebP webp	Widely available	No WPT tests			0 / 0
WebRTC webrtc	Widely available	Partial 0.9%	0.9%	0.9%	23 / 2309
WebRTC SCTP information webrtc-sctp	Widely available	Not yet	0.0%	0.0%	0 / 19
WebRTC statistics webrtc-stats	Widely available	Partial 4.3%	4.3%	4.3%	2 / 46
WebSockets websockets	Widely available	Partial 88%	88%	88%	756 / 857	worker-variant 27, tentative 18	CloseEvent, WebSocket
WebVTT webvtt	Widely available	Not yet	0.0%	0.0%	0 / 139	needs-reftests 135
WebVTT cue settings webvtt-cue-settings	Widely available	Not yet	0.0%	0.0%	0 / 10
white-space white-space	Widely available	Partial 14%	14%	14%	37 / 250	needs-reftests 531, other 6, manual 1
white-space-collapse white-space-collapse	Widely available	Full	100%	100%	51 / 51	needs-reftests 4
Width and height width-height	Widely available	Full	100%	100%	140 / 140	needs-reftests 745, other 69, manual 6, not-html 1
will-change will-change	Widely available	Full	100%	100%	173 / 173	needs-reftests 47, other 1
Window window	Widely available	Partial 13%	13%	13%	139 / 1002		Window
window.print() print	Widely available	Not yet	0.0%	0.0%	0 / 3	other 1
word-break word-break	Widely available	Not run its tests are needs-reftests			0 / 0	needs-reftests 80
word-spacing word-spacing	Widely available	Full	100%	100%	33 / 33	needs-reftests 80
writing-mode writing-mode	Widely available	Partial 14%	14%	14%	53 / 365	needs-reftests 1125, other 72, manual 62
X-Frame-Options x-frame-options	Widely available	No WPT tests			0 / 0
XMLHttpRequest xhr	Widely available	Partial 87%	87%	87%	1866 / 2143	worker-variant 6, manual 3	ProgressEvent
XMLSerializer xml-serializer	Widely available	Partial 93%	93%	93%	31 / 33	not-html 1
XPath xpath	Widely available	Partial 98%	98%	98%	1146 / 1166	other 2	Document, XPathEvaluator, XPathExpression, XPathResult
z-index z-index	Widely available	Full	100%	100%	14 / 14	needs-reftests 35, other 21
::details-content details-content	Newly available	Not yet	0.0%	0.0%	0 / 1	needs-reftests 5
::target-text target-text	Newly available	Not run its tests are needs-reftests			0 / 0	needs-reftests 19
:open open-pseudo	Newly available	Not yet	0.0%	0.0%	0 / 5	needs-reftests 4
:state() state	Newly available	Partial 7.4%	7.4%	7.4%	4 / 54
@scope scope	Newly available	Partial 15%	15%	15%	45 / 289	needs-reftests 14, other 3
@starting-style starting-style	Newly available	Partial 20%	20%	20%	5 / 25	other 1
<input type="file" webkitdirectory> input-file-webkitdirectory	Newly available	Not run its tests are manual			0 / 0	manual 1
<link rel="dns-prefetch"> link-rel-dns-prefetch	Newly available	No WPT tests			0 / 0
abs() and sign() abs-sign	Newly available	Partial 96%	96%	96%	307 / 319
Active view transition active-view-transition	Newly available	Not run its tests are needs-reftests			0 / 0	needs-reftests 3
alpha() alpha	Newly available	No WPT tests			0 / 0
Alt text for generated content alt-text-generated-content	Newly available	Not yet	0.0%	0.0%	0 / 99
Animation accessors animations-css-animation-accessors	Newly available	No WPT tests			0 / 0
ariaNotify() arianotify	Newly available	Not run its tests are manual			0 / 0	manual 10
Async clipboard async-clipboard	Newly available	Not yet	0.0%	0.0%	0 / 63
Asynchronously iterable streams async-iterable-streams	Newly available	Not yet	0.0%	0.0%	0 / 82	worker-variant 2
Atomics.pause() atomics-pause	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Atomics.waitAsync() atomics-wait-async	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
autocorrect autocorrect	Newly available	Partial 11%	11%	11%	1 / 9	manual 1
backdrop-filter backdrop-filter	Newly available	Partial 89%	89%	89%	1083 / 1213	needs-reftests 93, other 3
baseline-shift baseline-shift	Newly available	Partial 84%	84%	84%	22 / 26	needs-reftests 8
Branch hinting (WebAssembly) wasm-branch-hinting	Newly available	No WPT tests			0 / 0
ClipboardItem.supports() clipboard-supports	Newly available	No WPT tests			0 / 0
Color management for WebGL webgl-color-management	Newly available	No WPT tests			0 / 0
Color management for WebGL2 webgl2-color-management	Newly available	No WPT tests			0 / 0
Container style queries container-style-queries	Newly available	Partial 3.3%	3.3%	3.3%	10 / 299	needs-reftests 2
content-visibility content-visibility	Newly available	Partial 9.3%	9.3%	9.3%	28 / 300	needs-reftests 120, other 49
contenteditable="plaintext-only" contenteditable-plaintextonly	Newly available	Not yet	0.0%	0.0%	0 / 2
contrast-color() contrast-color	Newly available	Partial 95%	95%	95%	44 / 46	needs-reftests 2
cookieEnabled cookie-enabled	Newly available	Not yet	0.0%	0.0%	0 / 2	manual 1
crisp-edges crisp-edges	Newly available	Not run its tests are needs-reftests			0 / 0	needs-reftests 50
CSP violation reports reporting-csp-violations	Newly available	No WPT tests			0 / 0
Custom highlights highlight	Newly available	Partial 4.1%	4.1%	4.1%	7 / 167	needs-reftests 111, other 4
dialog.requestClose() requestclose	Newly available	Not yet	0.0%	0.0%	0 / 79	other 6
document.caretPositionFromPoint() document-caretpositionfrompoint	Newly available	Partial 4.5%	4.5%	4.5%	1 / 22
Event timing performance entries event-timing	Newly available	Partial 19%	19%	19%	30 / 156	worker-variant 2, manual 1
Exception references with exnref (WebAssembly) wasm-exnref-exceptions	Newly available	Partial 61%	61%	61%	13 / 21
EXT_texture_compression_rgtc WebGL extension ext-texture-compression-rgtc	Newly available	No WPT tests			0 / 0
EXT_texture_norm16 WebGL extension ext-texture-norm16	Newly available	No WPT tests			0 / 0
Fetch priority fetch-priority	Newly available	Partial 61%	61%	61%	16 / 26
field-sizing field-sizing	Newly available	Partial 27%	27%	27%	24 / 87	needs-reftests 4
Float16Array float16array	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
font-size-adjust font-size-adjust	Newly available	Partial 99.8%	99.8%	99.8%	1029 / 1031	needs-reftests 22, other 3
Garbage collection (WebAssembly) wasm-garbage-collection	Newly available	Partial 17%	17%	17%	203 / 1179
getHTML() gethtml	Newly available	Not yet	0.0%	0.0%	0 / 6911
Gradient interpolation gradient-interpolation	Newly available	Full	100%	100%	2622 / 2622
HTTP/3 http3	Newly available	No WPT tests			0 / 0
Intl.DurationFormat intl-duration-format	Newly available	Not yet	0.0%	0.0%	0 / 208
Intl.Locale info intl-locale-info	Newly available	Not run its tests are test262-intl402			0 / 0
Invoker commands invoker-commands	Newly available	Partial 17%	17%	17%	140 / 819	other 2
Iterator methods iterator-methods	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Iterator.concat() iterator-concat	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
JavaScript modules in service workers js-modules-service-workers	Newly available	Not yet	0.0%	0.0%	0 / 17
JavaScript modules in shared workers js-modules-shared-workers	Newly available	Not run its tests are worker-variant			0 / 0	worker-variant 11
JavaScript promise integration (WebAssembly) wasm-jspi	Newly available	No WPT tests			0 / 0
JSON import attributes json-modules	Newly available	No WPT tests			0 / 0
JSON source text access json-raw	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Largest contentful paint (LCP) performance entries largest-contentful-paint	Newly available	Not yet	0.0%	0.0%	0 / 95
light-dark() light-dark	Newly available	Partial 39%	39%	39%	15 / 38	needs-reftests 4
light-dark() image values light-dark-image	Newly available	No WPT tests			0 / 0
Map getOrInsert() getorinsert	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Math font family font-family-math	Newly available	No WPT tests			0 / 0
Math.sumPrecise() math-sum-precise	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Mutually exclusive <details> elements details-name	Newly available	Partial 5.5%	5.5%	5.5%	1 / 18
Name-only container queries container-name-queries	Newly available	No WPT tests			0 / 0
Navigation API navigation	Newly available	Partial 0.1%	0.1%	0.1%	1 / 543	tentative 10, other 3, manual 1
overflow-anchor overflow-anchor	Newly available	Partial 16%	16%	16%	2 / 12
Page setup page-setup	Newly available	Partial 7.0%	7.0%	7.0%	10 / 142	needs-reftests 84, manual 44
Popover popover	Newly available	Partial 0.1%	0.1%	0.1%	2 / 3857	needs-reftests 19, other 13	HTMLElement
print-color-adjust print-color-adjust	Newly available	Not yet	0.0%	0.0%	0 / 4
progress() progress-function	Newly available	Partial 99%	99%	99%	138 / 139
Promise.try() promise-try	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
rcap unit rcap	Newly available	Not yet	0.0%	0.0%	0 / 1
rch unit rch	Newly available	Not yet	0.0%	0.0%	0 / 1
Readable byte streams readable-byte-streams	Newly available	Partial 2.0%	2.0%	2.0%	10 / 498	worker-variant 22, other 3
RegExp.escape() regexp-escape	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Registered custom properties registered-custom-properties	Newly available	Partial 12%	12%	12%	178 / 1378	needs-reftests 7, other 2
Relative colors relative-color	Newly available	Partial 95%	95%	95%	2432 / 2535	needs-reftests 16
Reporting API reporting	Newly available	Partial 26%	26%	26%	24 / 92	worker-variant 2
requestVideoFrameCallback() request-video-frame-callback	Newly available	Partial 32%	32%	32%	12 / 37
Resizable buffers resizable-buffers	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
revert-rule revert-rule	Newly available	No WPT tests			0 / 0
rex unit rex	Newly available	Not yet	0.0%	0.0%	0 / 1
ric unit ric	Newly available	Not yet	0.0%	0.0%	0 / 1
round(), mod(), and rem() round-mod-rem	Newly available	Partial 99.6%	99.6%	99.6%	592 / 594	other 1
ruby-align ruby-align	Newly available	Partial 50%	50%	50%	4 / 8	needs-reftests 5
ruby-position ruby-position	Newly available	Partial 23%	23%	23%	5 / 21
Scoped custom element registries scoped-custom-element-registries	Newly available	Partial 8.9%	8.9%	8.9%	39 / 438	not-html 1
Screen wake lock screen-wake-lock	Newly available	Partial 19%	19%	19%	14 / 73
Scroll to text fragment scroll-to-text-fragment	Newly available	Partial 5.1%	5.1%	5.1%	11 / 215	needs-reftests 1
Scroll-driven animations scroll-driven-animations	Newly available	Partial 18%	18%	18%	404 / 2160	needs-reftests 37, other 19
scrollbar-color scrollbar-color	Newly available	Partial 78%	78%	78%	15 / 19	needs-reftests 24
scrollbar-gutter scrollbar-gutter	Newly available	Partial 62%	62%	62%	61 / 97	needs-reftests 19, other 1
scrollbar-width scrollbar-width	Newly available	Partial 58%	58%	58%	35 / 60	needs-reftests 7
scrollend scrollend	Newly available	Partial 14%	14%	14%	9 / 64		Document
Selection composed ranges composed-ranges	Newly available	Not run its tests are tentative			0 / 0	tentative 5
Set methods set-methods	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
shape() shape-function	Newly available	Full	100%	100%	126 / 126
Shared worker shared-workers	Newly available	Not yet	0.0%	0.0%	0 / 12	worker-variant 49
sibling-count() and sibling-index() sibling-count	Newly available	Partial 58%	58%	58%	89 / 151
Spelling and grammar text decorations text-decoration-spelling-grammar	Newly available	No WPT tests			0 / 0
Tail call optimization (WebAssembly) wasm-tail-call-optimization	Newly available	Partial 42%	42%	42%	104 / 242
text-decoration-skip-ink: all text-decoration-skip-ink-all	Newly available	No WPT tests			0 / 0
text-indent: each-line text-indent-each-line	Newly available	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
text-indent: hanging text-indent-hanging	Newly available	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
text-wrap text-wrap	Newly available	Partial 87%	87%	87%	85 / 97	needs-reftests 1
text-wrap: balance text-wrap-balance	Newly available	Full	100%	100%	9 / 9	needs-reftests 25, other 2
ToggleEvent source toggleevent-source	Newly available	Not yet	0.0%	0.0%	0 / 20
Top-level await top-level-await	Newly available	Partial 50%	50%	50%	2 / 4
transition-behavior transition-behavior	Newly available	Partial 80%	80%	80%	29 / 36
Trusted types trusted-types	Newly available	Partial 1.3%	1.3%	1.3%	49 / 3657	worker-variant 15, not-html 4, needs-reftests 1, other 1
Typed function references (WebAssembly) wasm-typed-fun-refs	Newly available	Partial 25%	25%	25%	50 / 199
Uint8Array base64 and hex conversion uint8array-base64-hex	Newly available	Excluded ECMAScript, which test262 tests, not WPT			0 / 0
Unsanitized HTML parsing parse-html-unsafe	Newly available	Not yet	0.0%	0.0%	0 / 83
URLPattern urlpattern	Newly available	Partial 0.6%	0.6%	0.6%	10 / 1636	worker-variant 14
Vertical form controls vertical-form-controls	Newly available	Not yet	0.0%	0.0%	0 / 16	needs-reftests 36
View transitions view-transitions	Newly available	Partial 1.0%	1.0%	1.0%	1 / 98	needs-reftests 293, other 20	Window
view-transition-class view-transition-class	Newly available	Full	100%	100%	24 / 24	needs-reftests 16
WebRTC encoded transform webrtc-encoded-transform	Newly available	Partial 8.9%	8.9%	8.9%	22 / 245	tentative 18
WebTransport webtransport	Newly available	Partial 0.8%	0.8%	0.8%	6 / 720	worker-variant 66, other 1
willReadFrequently canvas-2d-willreadfrequently	Newly available	No WPT tests			0 / 0
zoom zoom	Newly available	Partial 76%	76%	76%	346 / 453	needs-reftests 110, other 9
Zstandard compression zstd	Newly available	Partial 16%	16%	16%	4 / 25	worker-variant 8
__proto__ proto	Limited availability	No WPT tests			0 / 0
::column column-pseudo	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5, needs-reftests 2
::marker marker	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 68, not-in-suite 11
::scroll-button scroll-buttons	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 21, needs-reftests 19, other 1
::selection selection	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 73, not-in-suite 4, manual 3, other 1, not-html 1
::spelling-error and ::grammar-error spelling-grammar-error	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 4, manual 2, other 2
:autofill autofill	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
:has-slotted has-slotted	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 20, not-in-suite 9
:host-context() host-context	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 3, not-in-suite 2
:target-within target-within	Limited availability	No WPT tests			0 / 0
@function function	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25
@mixin mixin	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25
<datalist> datalist	Limited availability	Not run its tests are needs-reftests			0 / 0	not-in-suite 2, needs-reftests 2, other 2	HTMLDataListElement
<dialog closedby> dialog-closedby	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7, other 1
<fencedframe> fencedframe	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 9
<geolocation> geolocation-element	Limited availability	No WPT tests			0 / 0
<img sizes="auto" loading="lazy"> sizes-auto	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 6, needs-reftests 4, other 1
<input type="checkbox" switch> switch-control	Limited availability	No WPT tests			0 / 0
<input type="color"> input-color	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
<input type="month"> input-date-time-month	Limited availability	No WPT tests			0 / 0
<input type="week"> input-date-time-week	Limited availability	No WPT tests			0 / 0
<install> install	Limited availability	No WPT tests			0 / 0
<link rel="expect"> link-rel-expect	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12
<link rel="prefetch"> link-rel-prefetch	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
<meta name="application-title"> meta-application-title	Limited availability	No WPT tests			0 / 0
<meta name="text-scale"> meta-text-scale	Limited availability	No WPT tests			0 / 0
<meta name="theme-color"> meta-theme-color	Limited availability	No WPT tests			0 / 0
<template for> template-for	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 53, tentative 18
<usermedia> usermedia	Limited availability	No WPT tests			0 / 0
2D canvas opacity canvas-2d-alpha	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 6
Accelerometer accelerometer	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12, manual 1
accent-color accent-color	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 7, not-in-suite 7
AccentColor and AccentColorText system-color-accentcolor	Limited availability	No WPT tests			0 / 0
Accessor methods accessor-methods	Limited availability	No WPT tests			0 / 0
Ad selection ad-selection	Limited availability	No WPT tests			0 / 0
alignment-baseline alignment-baseline	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 9, not-in-suite 4
alpha and colorspace attributes for <input type=color> input-color-alpha	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Alternative style sheets alternative-style-sheets	Limited availability	Partial 66%	66%	66%	4 / 6	other 8, needs-reftests 1
Ambient light sensor ambient-light	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10
Anchor position container queries container-anchor-position-queries	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 16, needs-reftests 2
Anchor positioning anchor-positioning	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 251, needs-reftests 238, other 45
Anchor positioning animations and transitions anchor-positioning-animations	Limited availability	No WPT tests			0 / 0
Anchor positioning transforms anchor-positioning-transforms	Limited availability	No WPT tests			0 / 0
Anchors (WebXR) webxr-anchors	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7
anchors-valid and anchors-visible anchor-positioning-position-visibility-plurals	Limited availability	No WPT tests			0 / 0
Application shortcuts app-shortcuts	Limited availability	Not run its tests are manual			0 / 0	manual 10
arguments.callee arguments-callee	Limited availability	No WPT tests			0 / 0
at-rule() supports-at-rule	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 6, not-in-suite 2
attr() attr	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25, needs-reftests 23, other 1, not-html 1
Attribution reporting attribution-reporting	Limited availability	No WPT tests			0 / 0
Audio and video tracks audio-video-tracks	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Audio session audio-session	Limited availability	No WPT tests			0 / 0
AudioListener audiolistener	Limited availability	No WPT tests			0 / 0
AudioListener setPosition() and setOrientation() audiolistener-setposition-setorientation	Limited availability	No WPT tests			0 / 0
Augmented reality webxr-ar	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
autocapitalize autocapitalize	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Back/forward cache blocking reasons bfcache-blocking-reasons	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 13
Background fetch background-fetch	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 14, worker-variant 2
Background sync background-sync	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2, other 1
background-attachment background-attachment	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 46, manual 12, other 3, not-in-suite 3
background-clip: border-area background-clip-border-area	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 20
background-clip: text background-clip-text	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 29
Badging badging	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
Barcode detector barcode	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 23, worker-variant 2
baseline-source baseline-source	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 17, needs-reftests 1
Battery status battery	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 17, manual 5
beforeinstallprompt beforeinstallprompt	Limited availability	No WPT tests			0 / 0
beforeunload beforeunload	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8, manual 1	Window
blocking="render" blocking-render	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 56, other 1
border-shape border-shape	Limited availability	No WPT tests			0 / 0
box-decoration-break box-decoration-break	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 36, not-in-suite 4, other 3
calc-size() calc-size	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 22, not-in-suite 16, other 1
Capture Handle capture-handle	Limited availability	No WPT tests			0 / 0
captureStream() for <audio> and <video> capture-stream-audio-video	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
caret-shape caret-shape	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 25, not-in-suite 1
Case-sensitive attribute selector case-sensitive-attributes	Limited availability	No WPT tests			0 / 0
Clearing site data clear-site-data	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 15
clip clip	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 90, other 16, not-in-suite 2, manual 1
clipboardchange clipboardchange	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
CloseWatcher closewatcher	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 55
COEP violation reports reporting-coep-violations	Limited availability	No WPT tests			0 / 0
Color management for 2D canvas canvas-2d-color-management	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 27, other 1
color-adjust color-adjust	Limited availability	No WPT tests			0 / 0
color-contrast() color-contrast	Limited availability	Not run its tests are other			0 / 0	other 1
color-mix() with three or more colors color-mix-variadic	Limited availability	No WPT tests			0 / 0
COLRv1 colrv1	Limited availability	No WPT tests			0 / 0
Column breaks column-breaks	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 282, other 22, not-in-suite 16
column-wrap column-wrap	Limited availability	No WPT tests			0 / 0
Compression Dictionary Transport compression-dictionary-transport	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 31
Connection allowlists connection-allowlists	Limited availability	No WPT tests			0 / 0
Contact picker contact-picker	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Container scroll-state queries container-scroll-state-queries	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 57
Container timing performance entries container-timing	Limited availability	Not run its tests are tentative			0 / 0	tentative 39
Content Index content-index	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3, worker-variant 2
context-fill and context-stroke context-fill-stroke	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 7, not-html 1
contextlost and contextrestored canvas-context-lost	Limited availability	No WPT tests			0 / 0		CanvasRenderingContext2D, OffscreenCanvasRenderingContext2D
controlslist controls-list	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Cookie store cookie-store	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 49, worker-variant 27
cookieStore.get() metadata cookie-store-get-metadata	Limited availability	No WPT tests			0 / 0
corner-shape corner-shape	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 64, not-in-suite 25, other 1
CPU compute pressure compute-pressure	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 28, worker-variant 3
Crash report storage reporting-crashes-storage	Limited availability	No WPT tests			0 / 0
Crash reporting reporting-crashes	Limited availability	No WPT tests			0 / 0
Credentialless iframes iframe-credentialless	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 17, worker-variant 1
Cross-document view transitions cross-document-view-transitions	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 64, needs-reftests 4, other 1, manual 1
cross-fade() cross-fade	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 7, other 2, not-in-suite 1, manual 1
cross-origin() for url() url-cross-origin	Limited availability	No WPT tests			0 / 0
CSS import attributes css-modules	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 18
CSS object model (DOM level 2) css-object-model-discouraged	Limited availability	No WPT tests			0 / 0
CSS typed object model css-typed-om	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 129, worker-variant 22, other 11, needs-reftests 5
CSSPseudoElement css-object-model-csspseudoelement	Limited availability	No WPT tests			0 / 0
Cursor styles cursor	Limited availability	Not run its tests are manual			0 / 0	manual 152, not-in-suite 5
Custom ellipses custom-ellipses	Limited availability	No WPT tests			0 / 0
Custom formats for clipboard items clipboard-custom-format	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
Custom highlights from point highlightsfrompoint	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Custom media queries custom-media-queries	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2, needs-reftests 1
Customizable <select> customizable-select	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 100, needs-reftests 98, other 11
Customized built-in elements customized-built-in-elements	Limited availability	Partial 72%	72%	72%	523 / 717
Deprecation reports reporting-deprecation	Limited availability	No WPT tests			0 / 0
Depth sensing webxr-depth-sensing	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 19
Desynchronized 2D canvas canvas-2d-desynchronized	Limited availability	No WPT tests			0 / 0
Desynchronized WebGL canvas webgl-desynchronized	Limited availability	No WPT tests			0 / 0
Desynchronized WebGL2 canvas webgl2-desynchronized	Limited availability	No WPT tests			0 / 0
Device media queries device-queries	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 4
Device memory device-memory	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
Device posture device-posture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
Device-bound session credentials device-bound-session-credentials	Limited availability	No WPT tests			0 / 0
devicePixelRatio devicepixelratio	Limited availability	No WPT tests			0 / 0		Window
Digital credentials digital-credentials	Limited availability	No WPT tests			0 / 0
Digital goods digital-goods	Limited availability	No WPT tests			0 / 0
display animation display-animation	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
display-mode media query display-mode	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
display-state media query display-state	Limited availability	No WPT tests			0 / 0
display: contents display-contents	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 74, not-in-suite 12, other 2
display: ruby display-ruby	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 96, not-in-suite 9, other 6
Document colors document-colors	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
Document picture-in-picture document-picture-in-picture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 22, manual 2
Document-Isolation-Policy document-isolation-policy	Limited availability	No WPT tests			0 / 0
document.modelContext document-modelcontext	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 51, other 5
document.write() document-write	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 143, not-html 4	Document
DOM overlays for WebXR webxr-dom-overlays	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
dynamic-range-limit dynamic-range-limit	Limited availability	No WPT tests			0 / 0
Early data early-data	Limited availability	Full	100%	100%	2 / 2	worker-variant 2
EditContext edit-context	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 14, needs-reftests 1, other 1
Element capture element-capture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Element timing performance entries element-timing	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 52
Element-scoped view transitions view-transitions-element-scoped	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 36, not-in-suite 32, other 16
element() element	Limited availability	No WPT tests			0 / 0
Error.isError() is-error	Limited availability	No WPT tests			0 / 0
escape() and unescape() escape-unescape	Limited availability	No WPT tests			0 / 0
execCommand() execcommand	Limited availability	Not run its tests are other			0 / 0	other 8, not-in-suite 7
Explicit resource management explicit-resource-management	Limited availability	No WPT tests			0 / 0
EXT_disjoint_timer_query WebGL extension ext-disjoint-timer-query	Limited availability	No WPT tests			0 / 0
EXT_float_blend WebGL extension ext-float-blend	Limited availability	No WPT tests			0 / 0
EXT_frag_depth WebGL extension ext-frag-depth	Limited availability	No WPT tests			0 / 0
EXT_texture_compression_bptc WebGL extension ext-texture-compression-bptc	Limited availability	No WPT tests			0 / 0
Eyedropper eyedropper	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
fastSeek() fast-seek	Limited availability	No WPT tests			0 / 0
Feature policy feature-policy	Limited availability	No WPT tests			0 / 0
Federated credential management fedcm	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 82
Federated credentials federated-credentials	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Fetch form data fetch-formdata	Limited availability	No WPT tests			0 / 0
Fetch metadata request headers fetch-metadata	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 89, worker-variant 7
Fetch upload streams fetch-request-streams	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 6, worker-variant 6
fetchLater fetchlater	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 47
File handlers app-file-handlers	Limited availability	Not run its tests are manual			0 / 0	manual 1
File system access file-system-access	Limited availability	Not yet	0.0%	0.0%	0 / 8	manual 29, not-in-suite 5, worker-variant 2
filter() filter-function	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 14
fit-content() fit-content-function	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 17
flex-wrap: balance flexbox-flex-wrap-balance	Limited availability	No WPT tests			0 / 0
focusgroup focusgroup	Limited availability	No WPT tests			0 / 0
Font metric overrides font-metric-overrides	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 3, not-in-suite 1
font-language-override font-language-override	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 3
font-palette animation font-palette-animation	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
font-synthesis-position font-synthesis-position	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2, needs-reftests 1
font-variant-emoji font-variant-emoji	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 5, not-in-suite 3
font-variant-position font-variant-position	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 5, not-in-suite 3
font-width font-width	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Form-associated WebMCP attributes declarative-webmcp	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25
Fullscreen API fullscreen	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 82
Function caller and arguments functions-caller-arguments	Limited availability	No WPT tests			0 / 0
Gamepad (WebXR) webxr-gamepads	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Gamepad haptic feedback gamepad-haptics	Limited availability	Not run its tests are manual			0 / 0	manual 2
Gamepad touch buttons gamepad-touch	Limited availability	No WPT tests			0 / 0
Gamepad VR hands and poses gamepad-vr	Limited availability	No WPT tests			0 / 0
Gamut mapping gamut-mapping	Limited availability	No WPT tests			0 / 0
Gap decorations gap-decorations	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 549, not-in-suite 77, other 20
getBoxQuads() getboxquads	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
getYear() and setYear() date-get-year-set-year	Limited availability	No WPT tests			0 / 0
Global privacy control gpc	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5, worker-variant 2
glyph-orientation-vertical glyph-orientation-vertical	Limited availability	No WPT tests			0 / 0
Grid lanes grid-lanes	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 932, not-in-suite 92, tentative 17, other 10
Gyroscope gyroscope	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10
Hand input webxr-hand-input	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Hanging punctuation hanging-punctuation	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 23, not-in-suite 2
Heading offset heading-offset	Limited availability	No WPT tests			0 / 0
Heading pseudo-classes heading-selectors	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
hidden="until-found" hidden-until-found	Limited availability	Not yet	0.0%	0.0%	0 / 4	not-in-suite 9, needs-reftests 4
Hit test webxr-hit-test	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12
HTML media capture html-media-capture	Limited availability	Not run its tests are manual			0 / 0	manual 13, not-in-suite 2
HTML processing instructions html-processing-instructions	Limited availability	No WPT tests			0 / 0
HTML setter methods html-setters	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
HTML streaming setters html-streaming-setters	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 40, other 1
HTML wrapper methods html-wrapper-methods	Limited availability	No WPT tests			0 / 0
HTML-in-canvas canvas-html	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 170, needs-reftests 86, other 9
HTMLGeolocationElement initialPermissionStatus geolocation-element-initialpermissionstatus	Limited availability	No WPT tests			0 / 0
Hyphenate limit chars hyphenate-limit-chars	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
Idle detection idle-detection	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12
if() if	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8, other 1
image-rendering: smooth smooth	Limited availability	No WPT tests			0 / 0
image() image-function	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 5
ime-mode ime-mode	Limited availability	No WPT tests			0 / 0
Import assertions import-assertions	Limited availability	No WPT tests			0 / 0
import defer import-defer	Limited availability	No WPT tests			0 / 0
IndexedDB getAllRecords() getallrecords	Limited availability	Full	100%	100%	108 / 108	worker-variant 4	IDBIndex, IDBObjectStore
initial-letter initial-letter	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 66, not-in-suite 4, other 1
Ink ink	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
Insertable streams for MediaStreamTrack insertable-streams	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 17, tentative 2, worker-variant 1
Integrity violation reports reporting-integrity-violations	Limited availability	No WPT tests			0 / 0
integrity() for url() url-integrity	Limited availability	No WPT tests			0 / 0
Interaction contentful paint performance entries interaction-contentful-paint	Limited availability	Not run its tests are tentative			0 / 0	tentative 13
interactivity interactivity	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 9
Interest invokers interest-invokers	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 31, needs-reftests 15, other 1
interpolate-size interpolate-size	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 17
Intersection observer visibility tracking intersection-observer-v2	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 38
Intervention reports reporting-interventions	Limited availability	No WPT tests			0 / 0
inverted-colors media query inverted-colors	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
isInputPending() is-input-pending	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10, tentative 2
iterationComposite web-animations-iterationcomposite	Limited availability	No WPT tests			0 / 0
Iterator includes() iterator-includes	Limited availability	No WPT tests			0 / 0
Iterator join() iterator-join	Limited availability	No WPT tests			0 / 0
Iterator.zip() and Iterator.zipKeyed() iterator-zip-zipkeyed	Limited availability	No WPT tests			0 / 0
JPEG XL jpegxl	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 51, not-in-suite 12, other 5
justify-self in block layouts justify-self-block	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 4
Keyboard lock keyboard-lock	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7
Keyboard map keyboard-map	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
KHR_parallel_shader_compile WebGL extension khr-parallel-shader-compile	Limited availability	No WPT tests			0 / 0
Language detector languagedetector	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 6, other 1
LanguageModel languagemodel	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 108
Launch handler app-launch-handler	Limited availability	No WPT tests			0 / 0
Layers (WebXR) webxr-layers	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 23
Layout instability performance entries layout-instability	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 83
Lazy-loading media loading-lazy-media	Limited availability	No WPT tests			0 / 0
Lighting estimation webxr-lighting-estimation	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
line-clamp line-clamp	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 352, other 12, not-in-suite 8
Link parameters link-parameters	Limited availability	No WPT tests			0 / 0
Local fonts local-fonts	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12
Local network access local-network-access	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10, worker-variant 1
Long animation frames performance entries long-animation-frames	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 53
Long task performance entries longtasks	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 21
Magnetometer magnetometer	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10
Managed media source managed-media-source	Limited availability	No WPT tests			0 / 0
margin-trim margin-trim	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 42, not-in-suite 11
mask-border mask-border	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
MathML Full mathml-full	Limited availability	No WPT tests			0 / 0
Media element pseudo-classes media-pseudos	Limited availability	Not yet	0.0%	0.0%	0 / 5	not-in-suite 6
Media session media-session	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 9
Media source media-source	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 85, tentative 3, needs-reftests 1
MediaController mediacontroller	Limited availability	No WPT tests			0 / 0
Memory measurement measure-memory	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 14, worker-variant 2
Memory64 (WebAssembly) wasm-memory64	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25
moveBefore() move-before	Limited availability	Partial 42%	42%	42%	72 / 169	other 15, needs-reftests 2	Document, DocumentFragment, Element
Multi-memory (WebAssembly) wasm-multi-memory	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 41
Multiple import maps import-maps-multiple	Limited availability	No WPT tests			0 / 0
Mutation events mutation-events	Limited availability	No WPT tests			0 / 0
named-feature() supports-named-feature	Limited availability	No WPT tests			0 / 0
Navigation precommit handlers navigation-precommit-handlers	Limited availability	No WPT tests			0 / 0
Navigation timing confidence navigation-timing-confidence	Limited availability	No WPT tests			0 / 0
navigator.install() navigator-install	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
navigator.share() share	Limited availability	Not run its tests are manual			0 / 0	not-in-suite 15, manual 15
Network Information network-information	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Non-cookie storage access non-cookie-storage-access	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 13, worker-variant 2
Notifications notifications	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 20, manual 10, worker-variant 2, other 1
Numeric factory functions numeric-factory-functions	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
object-view-box object-view-box	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 40, not-in-suite 3
Observable observable	Limited availability	Not run its tests are tentative			0 / 0	tentative 52
OfflineAudioContext incremental rendering offline-audio-context-incremental-rendering	Limited availability	No WPT tests			0 / 0
OpaqueRange opaquerange	Limited availability	No WPT tests			0 / 0
Orientation Sensor orientation-sensor	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 16
Origin origin	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 20, worker-variant 3
overflow-clip-margin overflow-clip-margin	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 34, not-in-suite 6
overflow: overlay overflow-overlay	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 1
overlay overlay	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 9, not-in-suite 7, other 1
overscroll-behavior overscroll-behavior	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12
OVR_multiview2 WebGL extension ovr-multiview2	Limited availability	No WPT tests			0 / 0
Page break aliases page-break-aliases	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Page lifecycle page-lifecycle	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5, needs-reftests 1
Page selectors page-selectors	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 6
Page visibility state performance entries page-visibility-state	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
page-orientation page-orientation	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 5, not-in-suite 3
paint() paint	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 115, not-in-suite 2, other 1
Partitioned cookies partitioned-cookies	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7
Password credentials password-credentials	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
path() path-shape	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
Payment handler payment-handler	Limited availability	No WPT tests			0 / 0
Payment request payment-request	Limited availability	Not run its tests are manual			0 / 0	manual 35, not-in-suite 33
PerformanceTiming and PerformanceNavigation performancetiming	Limited availability	No WPT tests			0 / 0
Periodic background sync periodic-background-sync	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Permissions policy permissions-policy	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 115, manual 5, worker-variant 2, needs-reftests 1	HTMLIFrameElement
Permissions policy violation reporting reporting-permissions-policy-violations	Limited availability	No WPT tests			0 / 0
Picture-in-picture (video) picture-in-picture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 18
ping ping	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 19
Pointer lock pointer-lock	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 19, manual 7
popover="hint" popover-hint	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3, other 1
Portals portal	Limited availability	No WPT tests			0 / 0
prefers-reduced-data media query prefers-reduced-data	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
prefers-reduced-transparency media query prefers-reduced-transparency	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Presentation API presentation-api	Limited availability	Not run its tests are manual			0 / 0	manual 24, not-in-suite 13
Private click measurement private-click-measurement	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Private network access private-network-access	Limited availability	No WPT tests			0 / 0
Profiler profiler	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 25, tentative 1
Protected audience protected-audience	Limited availability	No WPT tests			0 / 0
Protocol handlers app-protocol-handlers	Limited availability	Not run its tests are manual			0 / 0	manual 1
random() random-function	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 20
Range syntax for style queries style-query-range-syntax	Limited availability	No WPT tests			0 / 0
Raw camera access for WebXR webxr-camera	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Read unsanitized clipboard data clipboard-unsanitized-formats	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
ReadableStream.from() readablestream-from	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2, worker-variant 2, other 1
reading-flow reading-flow	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 61, tentative 6
Reference target referencetarget	Limited availability	Not run its tests are tentative			0 / 0	tentative 16
referrer-policy() for url() url-referrer-policy	Limited availability	No WPT tests			0 / 0
RegExp compile() regexp-compile	Limited availability	No WPT tests			0 / 0
RegExp static properties regexp-static-properties	Limited availability	No WPT tests			0 / 0
Region capture region-capture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
registerProtocolHandler registerprotocolhandler	Limited availability	Not run its tests are manual			0 / 0	manual 5, not-in-suite 5
Related apps related-apps	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
Related website sets related-website-sets	Limited availability	No WPT tests			0 / 0
Relaxed-width SIMD (WebAssembly) wasm-simd-relaxed	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7
Remote playback remote-playback	Limited availability	Not run its tests are manual			0 / 0	not-in-suite 9, manual 9
requestIdleCallback() requestidlecallback	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 21
resizable media query resizable	Limited availability	No WPT tests			0 / 0
resize (CSS property) resize	Limited availability	Not run its tests are manual			0 / 0	manual 21, not-in-suite 5, needs-reftests 3
Responsive iframes frame-sizing	Limited availability	No WPT tests			0 / 0
Retriable module loading retriable-module-loading	Limited availability	No WPT tests			0 / 0
Reversed counter-reset counter-reset-reversed	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 27
Rhythmic sizing rhythmic-sizing	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 18, not-in-suite 17
ruby-overhang ruby-overhang	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 39, not-in-suite 2, other 1
Sanitizer API sanitizer	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 48
Save-Data savedata	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
Scheduler API scheduler	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 51, worker-variant 48, tentative 19
Screen capture screen-capture	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 14, tentative 1
Screen orientation lock screen-orientation-lock	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
Scroll marker target pseudo-classes scroll-marker-targets	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2
Scroll markers scroll-markers	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 76, not-in-suite 57, other 22
Scroll method promises scroll-promises	Limited availability	No WPT tests			0 / 0
Scroll snap events scroll-snap-events	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 18
scroll-axis-lock scroll-axis-lock	Limited availability	No WPT tests			0 / 0
scroll-initial-target scroll-initial-target	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 18
scroll-target-group scroll-target-group	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 13, not-in-suite 6, other 1
Scroll-triggered animations scroll-triggered-animations	Limited availability	No WPT tests			0 / 0
scrollIntoView() container scroll-into-view-container	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Secure payment confirmation secure-payment-confirmation	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 20
Serializable errors serializable-errors	Limited availability	No WPT tests			0 / 0
Service workers static routing service-workers-static-routes	Limited availability	No WPT tests			0 / 0
Share targets app-share-targets	Limited availability	No WPT tests			0 / 0
Shared storage shared-storage	Limited availability	No WPT tests			0 / 0
Shared storage locks shared-storage-locks	Limited availability	No WPT tests			0 / 0
Shared worker extended lifetime shared-workers-extended-lifetime	Limited availability	No WPT tests			0 / 0
SharedArrayBuffer in WebGL webgl-sab	Limited availability	No WPT tests			0 / 0
showPicker() for <input> show-picker-input	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
showPicker() for <select> show-picker-select	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 7
Signature-based resource integrity signature-based-resource-integrity	Limited availability	No WPT tests			0 / 0
Soft navigation performance entries soft-navigations	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 44, tentative 39
speak speak	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
speak-as speak-as	Limited availability	Not run its tests are manual			0 / 0	manual 4
Speculation rules speculation-rules	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 208, tentative 3
Speech recognition speech-recognition	Limited availability	Not run its tests are manual			0 / 0	manual 7, not-in-suite 7
Speech recognition grammar speech-recognition-grammar	Limited availability	No WPT tests			0 / 0
Storage buckets storage-buckets	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 16, worker-variant 12
stretch stretch	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 49, needs-reftests 29
String builtins (WebAssembly) wasm-string-builtins	Limited availability	Partial 45%	45%	45%	44 / 96	worker-variant 5
String substr() string-substr	Limited availability	No WPT tests			0 / 0
String trimLeft() and trimRight() string-trim-leftright	Limited availability	No WPT tests			0 / 0
Summarizer summarizer	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 22
SVG 1.1 svg-discouraged	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
SVG clipboard items clipboard-svg	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
symbols() symbols-function	Limited availability	No WPT tests			0 / 0
Table styling table-discouraged	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 14, not-in-suite 5
Temporal temporal	Limited availability	No WPT tests			0 / 0
Text import attributes text-modules	Limited availability	No WPT tests			0 / 0
text-autospace text-autospace	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 33, not-in-suite 6, other 3
text-box text-box	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 94, not-in-suite 15
text-decoration in ::selection text-decoration-selection	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 5, other 1
text-decoration-line: blink text-decoration-line-blink	Limited availability	Not run its tests are manual			0 / 0	manual 50, other 1
text-decoration-skip-spaces text-decoration-skip-spaces	Limited availability	No WPT tests			0 / 0
text-fit text-fit	Limited availability	No WPT tests			0 / 0
text-justify text-justify	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 15, not-in-suite 7, other 4
text-size-adjust text-size-adjust	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 5
text-spacing-trim text-spacing-trim	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 18, not-in-suite 4, other 1
text-wrap: pretty text-wrap-pretty	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Time-relative pseudo-selectors time-relative-selectors	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 10
toGMTString() date-to-gmt-string	Limited availability	No WPT tests			0 / 0
Topics topics	Limited availability	No WPT tests			0 / 0
Touch events touch-events	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 14, other 1, manual 1
Transferable streams transferable-streams	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 12, other 1, worker-variant 1
TransformStream transformer cancel() method transformstream-transformer-cancel	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 2, worker-variant 2
Translator translator	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 9
UI fonts font-family-ui	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 19
User agent client hints ua-client-hints	Limited availability	Partial 33%	33%	33%	1 / 3	not-in-suite 12
user-select user-select	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 10
Vibration vibration	Limited availability	Not run its tests are manual			0 / 0	manual 10, not-in-suite 4
video-dynamic-range media query video-dynamic-range	Limited availability	No WPT tests			0 / 0
Viewport segments viewport-segments	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Virtual keyboard virtual-keyboard	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3, manual 2
Virtual pressure sources virtual-pressure-sources	Limited availability	No WPT tests			0 / 0
Virtual sensors virtual-sensors	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Web app manifest manifest	Limited availability	Not run its tests are manual			0 / 0	manual 39
Web app manifest localization manifest-localization	Limited availability	No WPT tests			0 / 0
Web app origin migration app-migration	Limited availability	No WPT tests			0 / 0
Web authentication signal methods webauthn-signals	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 3
Web Bluetooth web-bluetooth	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 155
Web MIDI web-midi	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
Web NFC web-nfc	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 11, manual 4
Web serial serial	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 9, manual 6
WebCodecs webcodecs	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 154, other 4
WebDriver webdriver	Limited availability	Not run its tests are other			0 / 0	other 251, not-in-suite 1
WebDriver BiDi webdriver-bidi	Limited availability	Not run its tests are other			0 / 0	other 428
WEBGL_compressed_texture_pvrtc WebGL extension webgl-compressed-texture-pvrtc	Limited availability	No WPT tests			0 / 0
WEBGL_compressed_texture_s3tc WebGL extension webgl-compressed-texture-s3tc	Limited availability	No WPT tests			0 / 0
WEBGL_compressed_texture_s3tc_srgb WebGL extension webgl-compressed-texture-s3tc-srgb	Limited availability	No WPT tests			0 / 0
WEBGL_draw_buffers WebGL extension webgl-draw-buffers	Limited availability	No WPT tests			0 / 0
WEBGL_multi_draw WebGL extension webgl-multi-draw	Limited availability	No WPT tests			0 / 0
WebGPU webgpu	Limited availability	No WPT tests			0 / 0
WebGPU subgroups webgpu-subgroups	Limited availability	No WPT tests			0 / 0
WebHID webhid	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 6
WebNN webnn	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 193
WebOTP web-otp	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
WebUSB webusb	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 49, manual 5
WebVR webvr	Limited availability	No WPT tests			0 / 0
WebVTT cue alignment webvtt-cue-alignment	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 4
WebVTT regions webvtt-regions	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 20, needs-reftests 10
WebXR webxr-device	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 90
Wheel events wheel-events	Limited availability	Partial 16%	16%	16%	5 / 31	not-in-suite 3	WheelEvent
Wheel events momentum wheel-events-momentum	Limited availability	No WPT tests			0 / 0
Widows and orphans widows-orphans	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 25, manual 10, not-in-suite 1
Window Controls Overlay window-controls-overlay	Limited availability	Not run its tests are manual			0 / 0	manual 3, not-in-suite 1
Window management window-management	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 8
Window resizing window-management-resizing	Limited availability	No WPT tests			0 / 0
window-drag window-drag	Limited availability	No WPT tests			0 / 0
window.external external	Limited availability	No WPT tests			0 / 0
with with	Limited availability	No WPT tests			0 / 0
word-break: auto-phrase word-break-auto-phrase	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 16
word-break: break-word word-break-break-word	Limited availability	Not run its tests are needs-reftests			0 / 0	needs-reftests 8, not-in-suite 1
writing-mode SVG 1.1 values writing-mode-svg-values	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
writingsuggestions writingsuggestions	Limited availability	Not run its tests are not-in-suite			0 / 0	not-in-suite 1
XSLT xslt	Limited availability	Not run its tests are other			0 / 0	other 10, not-in-suite 6, needs-reftests 3