[whatwg] [media] played member expected behavior.

Ian Hickson ian at hixie.ch
Thu Apr 26 14:11:37 PDT 2012

On Thu, 26 Apr 2012, Paul Adenot wrote:
> The played member [1] description of the media element states :
> > The played attribute must return a new static normalized TimeRanges 
> > object that represents the ranges of the media resource, if any, that 
> > the user agent has so far rendered, at the time the attribute is 
> > evaluated.
> Currently implementing this member in Gecko, we are wondering the exact 
> meaning of the 'rendered' term. If one seek in a video to a location 
> while being in a paused state, the user agent 'renders' the frame at 
> that location, since it is displayed on the screen. No audio (if any) is 
> rendered, though.
> In that case, should we create an empty range starting and ending at the 
> time that was seeked to ? That means creating multiple empty ranges if 
> multiple seeks occur while being paused. Does the 'rendering' term 
> implies that playback should occur ? This description need clarification 
> to specify the exact behavior to adopt.
> Semantically, the name of the member itself ('played') seem to imply 
> playback.

I think playback probably is the most useful. The use case here was 
updating a playback scrub bar with colour for where the user has already 
watched the video, and zero-length entries aren't useful for that.

I've made a note of this e-mail to fix the spec, but in the absence of 
further information or opinions from anyone else, I'd go with playback as 
you suggest.

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

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