Hi Mounir, Replies inline below...
On Thu, Jul 5, 2018 at 2:56 AM, Mounir Lamouri <mou...@lamouri.fr> wrote: > Hi Chris, > > Very excited to see Firefox going forward with autoplay blocking. A couple > of comments inline. > > On Tue, 3 Jul 2018, at 19:38, Chris Pearce wrote: > > DETAILS: > > > > We intend to block autoplay of HTMLMediaElement in tabs which haven't > > had user interaction. Web authors should assume that they require a user > > gesture (mouse click on a "play" button for example) in order to play > > audible media. > > I assume you will not allow autoplay when navigating into the same > website? What about iframes? Will they be allowed to autoplay if the main > frame is allowed to? Will the feature policy be used instead? > > A gesture in any document in the document hierarchy gesture activates the top level document, and a document uses the top level document's gesture activation status to determine whether it can play (our implementation actually differs a bit, but this is the effective behaviour). Gesture activation status isn't preserved across navigation. So if the top level document navigates, the incoming document hierarchy won't be able to autoplay. If a non-top-level document navigates, the new document in the iframe will still use the top-level document's gesture activation status, and so the iframe's new content document will be able to autoplay. > > HTMLMediaElements with a "muted" attribute or "volume=0" are still > > allowed to play. > > Chrome and Safari allows autoplay only when the playback is muted. The > spec allows side effect for setting `muted = false;`. What will happen for > a website that changes the volume from 0 to something else? > > If an HTMLMediaElement starts playing with muted/volume=0 and then script sets it to unmuted/volume>0, then we'll pause the media. > Also, will autoplay be allowed when the video has no audio track? > > > Our autoplay logic ignores whether the media resource has an audio track; it makes our implementation simpler, and if an author knows a media should be inaudible, they can set the muted attribute. So a video element playing a media resource with no audio track and without the muted attribute would still be blocked. Cheers, Chris. _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
