MediaQueryListEvent

matchMedia matchmedia

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

niso: Partial 40%. 43 of 106 subtests pass, by system: Linux 40%, macOS 40%. 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 · MediaQueryList, MediaQueryListEvent, Window

MediaQueryListEvent is an interface in idl/uievents.webidl, inheriting Event, 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
matchMedia	Widely available	Partial 40% 43 of 106 subtests pass	4

Members

constructor

constructor

constructor(DOMString type, optional MediaQueryListEventInit eventInitDict = {});

int32_t niso_media_query_list_event_new(niso_dom* dom, const char* type, size_t type_len, const niso_media_query_list_event_init* event_init_dict, niso_handle* out);

media

attribute

readonly attribute DOMString media;

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

matches

attribute

readonly attribute boolean matches;

int32_t niso_media_query_list_event_get_matches(niso_dom* dom, niso_handle self, bool* out);