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Issue 749419 link

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Issue metadata

Status: Available
Owner: ----
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Windows
Pri: 2
Type: Bug



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'box-shadow' sporadically not correct removed on 4K

Reported by i...@elookon.de, Jul 27 2017

Issue description

UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.78 Safari/537.36

Steps to reproduce the problem:
1. box-shadow: 0 0 0 0.05rem #359FDC;

What is the expected behavior?

What went wrong?
I am not sure what causes this but 'box-shadow' is sporadically not correct removed.

For example when using it with :focus. Then a line from the box-shadow remains as you see in the screenshot.

I noticed this only on native 4K (3840 × 2160) with Windows 10 125 % DPI scaling and using font-size 120 % with @media.

The error only occcurs in Chrome.

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 60.0.3112.78  Channel: stable
OS Version: 10.0
Flash Version:
 
box-shadow.png
6.1 KB View Download

Comment 1 by i...@elookon.de, Jul 27 2017

When moving the tab to my WQHD screen the bug does not occur. It seems it is a 4K problem.
Labels: Needs-Triage-M60
Components: -Blink>CSS Blink>Paint

Comment 4 by hdodda@chromium.org, Jul 28 2017

Cc: hdodda@chromium.org
Labels: Needs-Feedback
@info-- Thanks for reporting the issue. Could you please provide us the sample url/file to reproduce the issue, that would help us in traiging the issue better.

Thanks!

Comment 5 by i...@elookon.de, Jul 28 2017

Sample URL is a problem because it is a development environment. I'll try to create an example, but I'm not sure if it will work because the bug occurs very sporadically :(
Project Member

Comment 6 by sheriffbot@chromium.org, Jul 28 2017

Labels: -Needs-Feedback
Thank you for providing more feedback. Adding requester "hdodda@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Comment 7 by i...@elookon.de, Jul 29 2017

Dear friends,

first thank you for the fast response. I decided to gain you access to the development environment because this is the most proper way to reproduce the error.

You will need to click very often on "Einloggen" and "Abbrechen". Sometimes the bug occurs ten times in succession, sometimes you will need fifty attempts to see the error occurring.

Attached a screenshot again so you see how the bug looks like.

environment:
https://goo.gl/qxS983

htaccess login:
google:dev
bug.png
3.3 KB View Download

Comment 8 by i...@elookon.de, Jul 30 2017

You can also try it on this page when you zoom to 500 % and click on the checkbox:

https://goo.gl/wLWgDp

htaccess login:
google:dev

The bug seems to occur immediately then.
checkboxds.png
8.3 KB View Download
Cc: kavvaru@chromium.org
Labels: Needs-Feedback
Unable to login to the URLs provided https://goo.gl/wLWgDp, https://goo.gl/qxS983.

Used below credentials
htaccess login:
google:dev

Could you please check the attached screen cast and provide us the credentials to access the URL.
Also please confirm is the issue only with 4k monitor?

Thanks, 
749419.mp4
688 KB View Download

Comment 10 by i...@elookon.de, Jul 31 2017

You have to use 'google' for username and 'dev' (both without single quotes) for password :)

Bug only occurrs on 4K (3840 × 2160). I tested it also on WQHD (2560 x 1440), I could not notice the error there after many tries. Full HD I could not test because I don't own a full hd monitor but I think it is a 4K only problem.
Project Member

Comment 11 by sheriffbot@chromium.org, Jul 31 2017

Labels: -Needs-Feedback
Thank you for providing more feedback. Adding requester "kavvaru@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
Components: -Blink>Paint Blink>Paint>Invalidation
Labels: BugSource-User PaintTeamTriaged-20170801
Looks like an invalidation bug, but might also be a partial raster bug related to incorrect cull rects. Given it only appears on very large displays, we might just have a rounding issue.
Cc: wangxianzhu@chromium.org
Status: Available (was: Unconfirmed)
Project Member

Comment 14 by sheriffbot@chromium.org, Aug 2

Labels: Hotlist-Recharge-Cold
Status: Untriaged (was: Available)
This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
Status: Available (was: Untriaged)

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