This is an experimental technologyCheck 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.
Syntax
bool = aFontFaceSet.check(font); bool = aFontFaceSet.check(font, text);
Returns
A Boolean that is true if the font list is available
Parameters
font: a font specification using the CSS value syntax, e.g. "italic bold 16px Roboto"text: limit the font faces to those whose Unicode range contains at least one of the characters in text. This does not check for individual glyph coverage.
Examples
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.Specifications
| Specification | Status | Comment |
| CSS Font Loading Module Level 3The definition of 'check' in that specification. | Working Draft | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
Chrome
Full support 35 |
Edge
Full support ≤79 |
Firefox
Full support 41 |
IE
No support No |
Opera
? |
Safari
Full support 10 |
WebView Android
Full support 37 |
Chrome Android
Full support 35 |
Firefox Android
Full support 41 |
Opera Android
? |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
FontFaceSet.check() by Mozilla Contributors is licensed under CC-BY-SA 2.5.
