Comments on: Accessibility of HTML 5 video and audio elements

By: Martin

Martin — Tue, 09 Aug 2011 01:09:46 +0000

Great post! Expect the default behavior to improve as browsers compete to provide the best experience!!

By: Bruce Lawson’s personal site : Reading List 2

Bruce Lawson’s personal site : Reading List 2 — Mon, 21 Feb 2011 09:20:41 +0000

[...] turned off by people who cannot use a mouse and which drown out screen-readers”. (also see my Accessibility of HTML 5 video and audio elements) Posted in HTML5, Uncategorized, accessibility web standards . Follow comments via RSS feed. [...]

By: La balise video | Docteur HTML5

La balise video | Docteur HTML5 — Sun, 18 Apr 2010 15:54:05 +0000

[...] Accessibility of HTML 5 video and audio elements [...]

By: GusZus

GusZus — Wed, 01 Jul 2009 09:56:10 +0000

Thanks for your comment Philip Jägenstedt. I think your right, and i found out about this mozilla bugreport regarding stopping download after the DOM ready state is HAVE_CURRENT_DATA. Also the autobuffer attribute as a hint to download the whole video immediately makes only sense if it is expected that the useragent will at least not always do this by himself. My testing with Firefox 3.5 shows that this bug seems to be fixed. It doesn't load the video until i start playback. But sadly Safari 4 does.

By: Philip Jägenstedt

Philip Jägenstedt — Sun, 07 Jun 2009 12:08:21 +0000

GusZus, apart from requiring that the document load event be delayed until the first frame is decoded (if there is no poster attribute), the spec leaves it up to the UA when to fetch data and how much. Expect the default behavior to improve as browsers compete to provide the best experience. Still, if browsers are currently doing too poor of a job, you could simply use a script to replace an img element with a video element when clicked.

By: GusZus

GusZus — Sat, 06 Jun 2009 13:37:15 +0000

I try to research if there is a way to prevent the video-files from loading before a user request it. Only the image spezified by the poster-attribut should load its resource. After all a 45MB video-file is much larger than a 235KB image-file. And bandwidth is also a accessibility concern.

Flash kann do this by just loading an swf file and then on further request the video file.

If you can’t do this with HTML 5 video, you can’t really use it. Of course there could be some useragent preference to behave this way, but i think it should be the default.

Does someone have information about this? I’m unable to find an answer in the HTML 5 spec.