[whatwg] Author control over media preloading/buffering

Ian Hickson ian at hixie.ch
Thu Feb 26 01:19:13 PST 2009

On Wed, 25 Feb 2009, Robert O'Callahan wrote:
> Under "Once enough of the media data has been fetched to determine the 
> duration of the media resource, its dimensions, and other metadata", 
> after setting the state to HAVE_METADATA, steps 7 and 8 say
> > 7. Set the element's delaying-the-load-event flag to false. This stops 
> > delaying the load event.
> >
> > 8. This is the point at which a user agent that is attempting to 
> > reduce network usage while still fetching the metadata for each media 
> > resource would stop buffering, causing the networkState attribute to 
> > switch to the NETWORK_IDLE value, if the media element did not have an 
> > autobuffer or autoplay attribute.
> I suggested HAVE_CURRENT_DATA would be a better state for these actions, 
> and I still think so. These actions should not occur until the UA is 
> able to display the first frame of the video. Authors would want the 
> first frame of a non-autobuffered video to be visible, and the document 
> load event should fire after the first frame is available by analogy 
> with images.

I've updated the note as per your suggestion.

> Is there a particular reason why you think these things should happen at 

It was an oversight.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'

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