1405526 - HTML5 video controls missing stylesheet

Status: RESOLVED DUPLICATE of bug 1405543

(Toolkit :: Video/Audio Controls, defect, P1)

Description

[lalox2347]

Attachment: Screenshot (38).png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171003100226

Steps to reproduce:

Watch HTML5 video (sometimes only when right clicking and pressing view video).
Sometimes I get this error:"Video loading stopped. Video playback aborted due to a network error. Video Can't be played because the file is corrupt. Video format or MIME type is not supported. No video with supported format and MIME type found. Video playback aborted due to an unknown error." but the video still plays with the weird controls.


Actual results:

The controls change from normal to green bars in the left corner of the video.


Expected results:

Normal video controls.

Comment 1

[lalox2347]

Attachment: Screenshot (40).png

Comment 2

[Jean-Yves Avenard [:jya]]

I've seen similar issues on Linux, but the controls look even weirder there. Will post a screen capture next time it happens

Comment 3

[Ray Lin[:ralin]]

Reproducible in 58.0a1 (2017-10-05) on Mac, I can spot the issue every time visit: https://www.w3schools.com/html/html5_video.asp 

Looks like it's a recent regression since I didn't notice that earlier this week, and from the screenshot I suspect the problem seems that our stylesheets(in XBL) aren't loaded correctly.

Comment 4

[Ray Lin[:ralin]]

huh...the problem gone after browser restarted, and I can't find the regression window by ./mach mozregression -g 2017-10-01. 

Though the issue might be intermittent per bug 1405543, I'm a bit worry about what if users run into the same condition as I before restarting browser that the issue is 100% reproducible then... Not sure we can find a reliable STR, bit I'll not hurriedly restart my browser next time the issue occurs. :P 

Also https://bugzilla.mozilla.org/show_bug.cgi?id=1405543#c8 mentions that the issue might be related to servo, let's see if we can have some clues of the cause.

Comment 5

[Jean-Yves Avenard [:jya]]

Restarting typically fixes the issue.
Seems to happen when there's an update pending and it's waiting to restart

Comment 6

[lalox2347]

Thanks for all the replies.
But for some reason I still have this problem, I tried starting Firefox in safe mode and with a new profile.

Comment 7

[lalox2347]

(In reply to lalox2347 from comment #6)
> Thanks for all the replies.
> But for some reason I still have this problem, I tried starting Firefox in
> safe mode and with a new profile.

I think now it's happening only when I right click and press view video.

Comment 8

[Cameron McCormack (:heycam)]

Coming here after trying to reproduce bug 1405543, I opened the comment 3 URL and do see the unstyled video controls.  I do have an updating pending (I'm currently on 2017-10-03), but with two Nightly updates per day that is nearly always the case. :-)

Comment 9

[Jared Wein [:jaws] (please needinfo? me)]

[Tracking Requested - why for this release]: notable UI regression and functionality breakage. possibly related to stylo, so not marking v57 as affected just yet.

Comment 10

[Jared Wein [:jaws] (please needinfo? me)]

Through mozregression I was able to narrow this down to changeset 44053b9ef955 (no bug number in commit message).

Comment 11

[Jared Wein [:jaws] (please needinfo? me)]

https://hg.mozilla.org/integration/autoland/rev/44053b9ef955

Comment 12

[Jared Wein [:jaws] (please needinfo? me)]

Through mozregression I was able to narrow this down to changeset https://hg.mozilla.org/integration/autoland/rev/44053b9ef955 (no bug number in commit message). This commit references the following GitHub pull request: https://github.com/servo/servo/pull/18652

Comment 13

[Emilio Cobos Álvarez (:emilio)]

(In reply to lalox2347 from comment #7)
> (In reply to lalox2347 from comment #6)
> > Thanks for all the replies.
> > But for some reason I still have this problem, I tried starting Firefox in
> > safe mode and with a new profile.
> 
> I think now it's happening only when I right click and press view video.

_Thanks_ for this comment, now I've been able to repro on a local build and I can look to see what's going on.

Let's track this in bug 1405543.

Comment 14

[Liz Henry (:lizzard) (relman/hg->git project)]

Fixed in the duplicate.