1806208 - pixel snapping of cellspacing causes varying line thickness

Status: NEW

(Core :: Graphics, defect)

Description

[michael.ernst96]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0

Steps to reproduce:

Hey guys,

I just treated myself with a new gpu and monitor. With now 4k resolution i discovered a problem caused by firefox that's not relevant with lower resolutions up to 1920x1080 like i was using before.

I say caused by firefox because it's confirmed by me and others including that browsers such as google chrome or opera do not have this issue.

This is my (new) setup:

• Nvidia Geforce GT 1030
• EIZO FlexScan EV2785-BK
• Windows 10 Enterprise LTSC (Also tried Linux Mint Live CD)
• 3840x2160 resolution with 150% Scaling applied in Windows Settings
• Firefox Version: 102.6.0 ESR (Also tried the most recent non ESR Version)

Actual results:

So what exactly is the problem?

I'm running the pictured site (not accessible to the public) for my private stock trading purposes and as i marked in the picture the table borders have a different thickness in firefox despite they should all be equal in thickness (which they are in other browsers):
https://abload.de/img/firefoxvkd5f.png

Here is another site that uses the same software and therefore generates the same problem but is accessible to the public:
http://paed.com/wbboard

If i use firefox zoom feature and set to 133% the problem goes away.
If i apply 100% scaling in windows settings and firefox the problem also goes away.
(But virtually everything on screen appears to small then due to high resolution)

Expected results:

All lines should have the same thickness. (Just like in virtually any other browser)

I hope you guys can figure this out and roll out an update to fix this issue soon.

BTW: I know the forum software is kinda old but i simply love it and I'm not willing to part with it. :)

Comment 1

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Timothy Nikkel (:tnikkel)]

Looks like the cellspacing="1" property of a table is what determines the width of those lines. So fraction pixel widths and pixel snapping is probably what's going on here. Chrome seems to round. On Safari I can see the same problem as in Firefox.

Comment 3

[Daniel Bodea [:danibodea]]

I will confirm this report based on the last comment.