magicp Reporter
	Description • 8 years ago

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0
Build ID: 20160815030201

Steps to reproduce:

1. Start Nightly
2. Go to "Getting Started" (https://www.mozilla.org/en-US/firefox/central/)
3. Scroll down the page until youtube-embed "Firefox - How to set the Home page"
4. Open DevTools > Inspector
5. Run Eyedropper
6. Move the mouse quickly over the youtube-embed


Actual results:

The eyedropper becomes invisible if moving mouse quickly over the youtube-embed.

Regression range:
https://hg.mozilla.org/integration/fx-team/pushloghtml?fromchange=e0bc88708ffed39aaab1fbc0ac461d93561195de&tochange=a7a882d122e36defe6c2a102a28ae7dfc16311c5


Expected results:

The eyedropper does not become invisible if moving mouse quickly over the youtube-embed.

	Patrick Brosset <:pbro>
	Comment 1 • 8 years ago

Interestingly, this seems to only happen when you've scrolled down the page. 
For instance, I took the STR from comment 0 and made a change to them:

1. Start Nightly
2. Go to "Getting Started" (https://www.mozilla.org/en-US/firefox/central/)
3. Scroll down the page until youtube-embed "Firefox - How to set the Home page"
4. Open DevTools > Inspector
4a. Using the inspector, delete some of the elements that appear above the video, so it goes back up the page and doesn't require scrolling to be visible in the viewport
5. Run Eyedropper
6. Move the mouse quickly over the youtube-embed

I wasn't able to reproduce the bug when the page wasn't scrolled down.

If you do scroll down a little bit though, you see that it's only an offset problem. The eyedropper is visible but doesn't take the scrolltop offset into account when you move your mouse quickly on the embedded video.

	magicp Reporter
	Comment 2 • 8 years ago

(In reply to Patrick Brosset <:pbro> from comment #1)

> If you do scroll down a little bit though, you see that it's only an offset
> problem. The eyedropper is visible but doesn't take the scrolltop offset
> into account when you move your mouse quickly on the embedded video.

You are right! Please find attached video.

	Patrick Brosset <:pbro>
	Comment 3 • 8 years ago

Inspector bug triage (filter on CLIMBING SHOES).