STR: Visit https://bug942289.bugzilla.mozilla.org/attachment.cgi?id=8336996 (an ogg theora video screencast) EXPECTED RESULTS: Video is displayed. ACTUAL RESULTS: No video displayed. Regression range: { Last good nightly: 2013-11-07 First bad nightly: 2013-11-08 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=70de5e24d79b&tochange=f003c386c77a } If I right-click anywhere on the gray background and choose "Inspect Element", I see: <video style="height: 0px; width: 66%;" controls="" autoplay=""></video> The "height: 0px" seems to be the problem. :) If I manually adjust that (using the devtools), then I can see the video.

hg bisect points to: { changeset: 153951:f9a5108cf2b2 user: Jared Wein <jwein@mozilla.com> date: Mon Oct 28 13:27:53 2013 -0400 summary: Bug 704326 - Standalone audio files should have different style so they don't look awkward. r=smaug,dolske } (...which in retrospect I should have noticed immediately. I searched the pushlog for "video" and "media", but didn't search for "audio". :) )

...and it looks like this is a dupe of bug 937429. OK.