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Issue 756345 link

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Issue metadata

Status: Available
Owner: ----
EstimatedDays: ----
NextAction: ----
OS: Linux , Android
Pri: 2
Type: Bug

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border-top dissappear in a very specific situation

Reported by, Aug 17 2017

Issue description

Steps to reproduce the problem:
1. Use an Android device to open Chrome.
2. Open the attached bug.html.
3. See the attached bug.png.

What is the expected behavior?
border-top should be visible on the yellow div.

What went wrong?
No border-top on the yellow div.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 59.0.3071.125  Channel: stable
OS Version: 5.0.1
Flash Version: 

I can reproduce this with an hTC Nexus tablet (model: OP82100) and a Sony Xperia Z3+ (model: E6553). But I failed to reproduce with Asus Zenfone Max (model: Z010DD).

The file bug.html is the minimal webpage that I can come up with. Removing any of the non-background css attribute makes the issue disappear.

The most interesting part of this issue is the line-height of .text. If I set it to 31px or 33px instead of 32px, the border-top will appear. Furthermore, 64px and 128px make the border-top disappear.
739 bytes View Download

Comment 1 by, Aug 17 2017

Attach bug.png and okay.png.
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48.0 KB View Download

Comment 2 Deleted

Comment 3 by, Aug 23 2017

I can't see the screen shot in the link since I don't have a account. Can you paste it somewhere else? Thanks.
Tested the issue on ASUS_Z00AD Build/LRX21v with Android 5.0.0 on Latest Stable@ 60.0.3112.107 and was able to reproduce the issue. Please find the screen shot here.

This issue is not seen with Android 4.0 and 6.0 versions.
This issue is also reproducible in M56# 56.0.2924.0 also.

Changing the status to Untriaged, so that the issue would get addressed.
Thank You.

Comment 5 by, Aug 24 2017

Components: -Blink>HTML Blink>Paint
Labels: BugSource-User PaintTeamTriaged-20170825 OS-Linux
Status: Available (was: Untriaged)
I don't think this is an android specific bug, just that the devices happen to have screen sizes and DPI that cause the issue to appear. On linux the border disappears at 90% zoom level and then at 50%.

I'm guessing this is an issue with subpixel snapping at various resolutions. It's going to be hard to fix.
Labels: TE-DesktopTriage
Project Member

Comment 8 by, Aug 29

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 - Your friendly Sheriffbot
Status: Available (was: Untriaged)

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