[whatwg] HTML 5 video tag questions

Jonas Sicking jonas at sicking.cc
Tue Jul 14 03:34:16 PDT 2009

On Tue, Jul 14, 2009 at 3:05 AM, Robert O'Callahan<robert at ocallahan.org> wrote:
> On Tue, Jul 14, 2009 at 9:46 PM, Boris Zbarsky <bzbarsky at mit.edu> wrote:
>> For the current model, note that all the text says is "should not show
>> this content to the user".  While this is not defined anywhere, it doesn't
>> seem to indicate that the content's DOM should not exist, for example.  In
>> Gecko, at least, the image in your example will be loaded and hence its
>> onload will fire.
> There's actually a fairly major related problem here. We hide the fallback
> content by treating it as display:none. Currently Gecko has a huge bug where
> a display:none plugin does not load/run. This works out well for the video
> fallback case. If we fix that bug, then unless we do some special magic,
> plugin-based video fallback will run and play audio while the <video>
> element plays --- very bad.

It shouldn't be that hard to for plugins walk the parent chain to see
if there are any "active" video elements before starting the plugin.

> People have already discovered that <video src="hellokitty.ogv"><object
> data="hellokitty.ogv"></object></video> plays the audio track twice in
> Firefox, and aren't happy about it, although it's what the spec seems to
> suggest. I'm not sure how to modify the spec in a sane way to fix this case,
> though.

We can do what's described above for videos and audios too (i.e. walk
parent chain etc).

/ Jonas

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