PerformanceMark

Performance performance

Baseline: Widely available on the web, in every major browser since Sep 2015, and long enough to count on (since Mar 2018).

niso: Partial 54%. 603 of 1107 subtests pass, by system: Linux 54%, macOS 54%. 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 · Performance, PerformanceEntry, PerformanceMark, PerformanceMeasure

PerformanceMark is an interface in idl/performance.webidl, inheriting PerformanceEntry, exposed in Window, Worker. 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
Performance	Widely available	Partial 54% 603 of 1107 subtests pass	3

Members

constructor

constructor

constructor(DOMString markName, optional PerformanceMarkOptions markOptions = {});

int32_t niso_performance_mark_new(niso_dom* dom, const char* mark_name, size_t mark_name_len, const niso_performance_mark_options* mark_options, niso_handle* out);

detail

attribute

readonly attribute any detail;

int32_t niso_performance_mark_get_detail(niso_dom* dom, niso_handle self, niso_bytes* out);