This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support35 ?41 ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support3535 ?41 ? ? ?

Document Tags and Contributors

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