Summary: We've had some complaints at times about videos autoplaying on mobile
devices when sites request autoplay. We should be more mindful of users and try
to avoid using data if they don't want it. Sites should be doing this for us,
but we've encountered pages where that is not the case. I'm proposing that we
at least disable this if the audio/video has to be pulled over a (paid?) mobile
network. It may, because of the context that phones are used, be something we'd
disable on mobile in general. i.e. The bug report mentions someone using their
phone in a quiet setting at home. Theres also some power usage concerns that
this would help with. The spec allows this explicitly "Authors are urged to use
the autoplay attribute rather than using script to trigger automatic playback,
as this allows the user to override the automatic playback when it is not
desired". Sites (like games) that want to override this could still use
scripting to autoplay (and probably already do).
Link to standard:
http://www.w3.org/TR/html5/embedded-content-0.html#attr-media-autoplay
Platform coverage: Where will this be available? Android, Firefox OS
Estimated or target release: Aiming for Firefox 35.
Preference behind which this will be implemented: Not sure. We already have a
boolean media.autoplay.enabled. I think the best thing would probably be to
make it a tri-state.pref.
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