1214832 - Text twitches during CSS animations/transitions

Status: NEW

(Core :: XUL, defect)

Description

[arni2033]

Attachment: video - Text twitches during CSS animations-transitions.webm

STR:   (Win7_64, Nightly 44, 32bit, ID 20151012030612, new profile, both HWA on & off)
 [the easiest way to reproduce, but not the only one]
1. Open attached testcase 1, scroll the page to the bottom
2. Open devtools -> Inspector, dock it to the right side of window
3. Scroll markup-view to the bottom, click "Show all 433 nodes", scroll markup-view to the bottom.
4. Press F11 to switch to fullscreen mode

Result:       [watch video] Text on the page and in devtools - twitches during CSS transition
                           (not only fullscreen transition, because I encounter this everywhere)

Expectations: Text should not twitch.

Comment 1

[arni2033]

Attachment: testcase 1 - Text twitches during CSS animations-transitions.htm

Comment 2

[Justin [:JW_SoftvisionQA]]

This is a duplicate bug. Please look at bug id: 787647.

Comment 3

[arni2033]

Nope, it's not. I don't see any issues with testcase in that bug. Also, this bug (1214832) implies vertical animation that causes text twitching. I don't see any of those in bug 787647.
Have you watched the attached screencast?

Comment 4

[Justin [:JW_SoftvisionQA]]

I can reproduce this bug on 

 	Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:46.0) Gecko/20100101 Firefox/46.0

Will be marking as new and passing up to a developer.