1326998 - Fullscreen warning box tries to hide when I move mouse above it

Status: UNCONFIRMED

(Firefox :: General, enhancement)

Description

[arni2033]

>>>   My Info:   Win7_64, Nightly 49, 32bit, ID 20160526082509
STR_0:  (basic)
1. Open DOM fullscreen
2. Move mouse above fullscreen warning box for a while


>>>
STR_1:  (detailed)
1. Open https://www.youtube.com/watch?v=mD3v1B_aXw0 or attachment 8666690 [details] in that window
2. Click fullscreen button to switch to DOM fullscreen
3. Move mouse to the top side of the screen and move it a little to trigger fullscreen warning box
4. Keep moving mouse within fullscreen warning box to the left and right in a following way:
   move mouse from left side to the right, wait ~0.5s, then move mouse to the left, and so on


STR_2:  (detailed; difference in Step 3)
1. Open https://www.youtube.com/watch?v=mD3v1B_aXw0 or attachment 8666690 [details] in that window
2. Click fullscreen button to switch to DOM fullscreen
3. Switch to another application's window and back, wait ~1.5s until fullscreen warning box appears
4. Keep moving mouse within fullscreen warning box to the left and right in a following way:
   move mouse from left side to the right, wait ~0.5s, then move mouse to the left, and so on


AR:
 In last step you can see how fullscreen warning box regularly (with a predefined timeout) tries to
 slide to the top to hide, but moving mouse prevents this, so box briefly twitches as you move mouse.

ER:  Either X or Y or Z or T
 X) Fullscreen warning box shouldn't move if in the last ~3 seconds I moved mouse over
    some predefined area at the top of the screen.
    Reference of this behavior: video controls on Youtube. They disappear when you don't move mouse 5s
 Y) Warning box should disappear after ~5s after switching to DOM fullscreen,
    ragardless of mouse interation (current chrome behavior)
 Z) Fullscreen warning box shouldn't move if mouse is placed in a predefined area at the top of screen
 T) Any other way to remove said twitching, if Firefox team agrees that twitching UI is bad.