How to know when font-face has been applied

I found a solution after wondering why IE doesn’t suffer from this problem.

Firefox and Chrome/Safari triggers the DOMContentLoaded event before font-face is applied, thus causing the problem.

The solution is to not listen for DOMContentLoaded but instead go oldschool and listen to onreadystatechange and wait until the document.readyState === 'complete' which is always triggered after font-face is applied (as far as I can tell by my tests) – which is of course what always happens in IE since it doesn’t support DOMContentLoaded.

So basically you can roll-your-own event in jQuery called fontfaceapplied – maybe it should be built in 😉

document.onreadystatechange = function() {
    if (document.readyState === 'complete') 
        $(document).trigger('fontfaceapplied');
};

Funny fact: Opera does it right and waits to trigger DOMContentLoaded until font-face is applied.