The onloading EventHandler of the FontFaceSet interface processes loading events.
The loading event fires when the document begins loading fonts.
FontFaceSet.onloading = function; FontFaceSet.addEventListener('loading', function);
In the following example, when the font Ephesis starts to load, "Font is loading..." is printed to the console.
document.fonts.onloading = () => { console.log('Font is loading'); } (async () => { await document.fonts.load("16px Ephesis"); })();
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onloading | 
35  | 
79  | 
41  | 
No  | 
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10  | 
4.4.3  | 
35  | 
41  | 
22  | 
10  | 
3.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet/onloading