The onloadingerror EventHandler of the FontFaceSet interface processes loadingerror events.
The loadingerror event fires when fonts have finished loading, but some or all fonts have failed to load.
FontFaceSet.onloadingerror = function; FontFaceSet.addEventListener('loadingerror', function);
In the following example, if the font Ephesis fails to load, "Font loading error" is printed to the console.
document.fonts.onloadingerror = () => { console.log('Font loading error'); } (async () => { await document.fonts.load("16px Ephesis"); })();
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    https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet/onloadingerror