This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

The check() method of the FontFaceSet returns whether all fonts in the given font list have been loaded and are available.


bool = aFontFaceSet.check(font);
bool = aFontFaceSet.check(font, text);


A Boolean that is true if the font list is available



document.fonts.check("12px courier"); // returns true if the font courier is available at 12px

document.fonts.check("12px MyFont", "ß"); // returns true if the font 'MyFont' has a ß character. 


Specification Status Comment
CSS Font Loading Module Level 3
The definition of 'check' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 35.0 41 (41) ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support Not supported 35.0 41.0 (41) ? ? ? ? 35.0

Document Tags and Contributors

 Contributors to this page: teoli, Dan-Dascalescu
 Last updated by: teoli,