CSSFontFaceRule

@font-face font-face

Baseline: Widely available on the web, in every major browser since Sep 2016, and long enough to count on (since Mar 2019).

niso: Partial 28%. 4 of 14 subtests pass, by system: Linux 28%, macOS 28%. 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 · CSSFontFaceRule

CSSFontFaceRule is an interface in idl/cssom.webidl, inheriting CSSRule, 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
@font-face	Widely available	Partial 28% 4 of 14 subtests pass	2

Members

style

attribute

readonly attribute CSSStyleDeclaration style;

int32_t niso_css_font_face_rule_get_style(niso_dom* dom, niso_handle self, niso_handle* out);