CSSLayerBlockRule

Cascade layers cascade-layers

Baseline: Widely available on the web, in every major browser since Mar 2022, and long enough to count on (since Sep 2024).

niso: Partial 47%. 71 of 149 subtests pass, by system: Linux 47%, macOS 47%. Engines: QuickJS, the engine niso's WPT run uses; Node and Porffor have no recorded run. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · CSSLayerBlockRule

CSSLayerBlockRule is an interface in idl/cssom.webidl, inheriting CSSGroupingRule, exposed in Window. What it does is on MDN; this page says what niso has of it.

Status

The web features its members belong to, each with its Baseline status on the web and how much of the feature’s WPT suite passes in niso (see Web platform support).

Feature	On the web	In niso	Members
Cascade layers	Widely available	Partial 47% 71 of 149 subtests pass	2

Members

name

attribute

readonly attribute DOMString name;

int32_t niso_css_layer_block_rule_get_name(niso_dom* dom, niso_handle self, niso_str* out);