[whatwg] <video> ... <script> race condition
Philip Jägenstedt
philipj at opera.com
Fri May 13 02:40:59 PDT 2011
Problem:
<video src="video.webm"></video>
...
<script>
document.querySelector('video').oncanplay = function() {
/* will it run? */
};
</script>
In the above the canplay event can be replaced with many others, like
loadedmetadata and loadeddata. Whether or not the event handler has been
registered by the time the event is fired depends on how fast decoding is,
how fast the network is and how much "..." there is.
This is not new information, Simon Pieters wrote extensively about the
problem in
http://dev.opera.com/articles/view/consistent-event-firing-with-html5-video/
The reason I write now is that in one of our projects this exact race
condition happens to be hit for http://html5demos.com/video which is where
the above code snippet comes from.
Does anyone have ideas about how to deal with this problem, which *is*
going to appear on many real-world pages? Is there any browser that has
already done something to mitigate the problem?
--
Philip Jägenstedt
Core Developer
Opera Software
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