1325077 - Playing a video on Vimeo when RDM active goes fullscreen

Status: RESOLVED INVALID

(DevTools :: Responsive Design Mode, defect, P3)

Description

[Cristian Comorasu, QA [:ccomorasu], Releae Desktop QA - Please contact [e-mail]]

[Affected versions]:
 Fx 52.0a2 (20161219004024)

[Affected platforms]:
 Windows 10 x64
 Ubuntu 14.04 LTS
 Mac OS X 10.12

[Steps to reproduce]:
 1. Open Firefox.
 2. Go to "www.vimeo.com"
 3. Open RDM (ctrl/cmd+shift+m).
 4. Select any mobile device.
 5. Play a random video.

[Expected result]:
 The video plays accordingly.

[Actual result]:
 The video goes fullscreen (out of the viewport).

[Regression range]:
 Last good: 20161005030211
 First bad: 20161006030208
 Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ea104eeb14cc54da9a06c3766da63f73117723a0&tochange=777fb63db8de8d78b64b8141d1a998397275dd03

*I considered the build from 2016-10-05 as a good build because it exited the full screen (glitch effect) although the video did not play.

[Notes]:
 a. Gif with the issue: http://imgur.com/a/NCmlS .
 b. This issue also reproduces with Facebook clips.
 c. The latest nightly is not affected.

Comment 1

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

I can't seem to reproduce this one.  The GIF mentioned in comment 0 seems to be about bug 1325056.  Do you have a GIF or something for this issue?

Comment 2

[Cristian Comorasu, QA [:ccomorasu], Releae Desktop QA - Please contact [e-mail]]

I can still reproduce it on both nightly and aurora. I made two new gifs with this issue.


Nightly: http://imgur.com/a/bYqMo
Aurora: http://imgur.com/a/lszHv

Comment 3

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

Thanks for the updated GIF.  I can't seem to reproduce on macOS, but you seem to use Windows in the GIF, so I'll try that soon.

Comment 4

[Cristian Comorasu, QA [:ccomorasu], Releae Desktop QA - Please contact [e-mail]]

After further investigation, this issue is reproducible on Mac OS X. However the device selected at step 4 affect the behaviour for all the OS's mentioned in the description. 
i.e: Apple iPhone 4 - unaffected
     Google Nexus 4 - affected

Cheers!

Comment 5

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

To clarify, I can also repro on macOS with additional info in comment 4.

I had more time to look at this today.

The difference between iPhone 4 vs. Nexux 4 is because of the site itself: it uses UA detection to decide if you have fullscreen support.  With iPhone 4, it decides you do not, so it doesn't try to request fullscreen.

So, the only remaining issue is that it pops the entire browser window fullscreen, but with some tab UI still at the top.

I believe bug 1325576 (also about fullscreen issues) is sufficient to track this remaining portion.