Open Bug 1295553 Opened 6 years ago Updated 2 months ago

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

Categories

(DevTools :: Inspector, defect, P2)

defect

Tracking

(firefox48 unaffected, firefox49 unaffected, firefox50 affected, firefox51 affected)

Tracking Status
firefox48 --- unaffected
firefox49 --- unaffected
firefox50 --- affected
firefox51 --- affected

People

(Reporter: magicp.jp, Unassigned)

References

Details

Attachments

(2 files)

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.
Blocks: 1262439
Has Regression Range: --- → yes
Has STR: --- → yes
Component: Untriaged → Developer Tools: Inspector
OS: Unspecified → All
Hardware: Unspecified → All
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.
(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.
Inspector bug triage (filter on CLIMBING SHOES).
Priority: -- → P2
Product: Firefox → DevTools
Severity: normal → S3
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