This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
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
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.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 |
| 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 | No support | 35.0 | 41.0 (41) | ? | ? | ? | ? | 35.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet/check