679335 - Arrow shapes via CSS borders get additional "ghost border"

Status: RESOLVED DUPLICATE of bug 646053

(Core :: Graphics, defect)

Description

[Veit Lehmann]

Attachment: ff4-to-current-ghost-border-bug.png

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1

Steps to reproduce:

Take following HTML/CSS snippet:
<div style="border: 20px solid transparent; border-left-color: #eee;"></div>

It creates an arrow-like shape without using an image.


Actual results:

Ghost borders appear on the edges where the solid border touches a transparent border. See screenshot.

This behaviour exists starting from version 4.


Expected results:

There should be no ghost borders. See screenshot.

Comment 1

[AndreiD[QA]]

ID:  Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:8.0a1) Gecko/20110815 Firefox/8.0a1

I could not reproduce the issue; using Firefox Nightly, currently Fx8
What version of Firefox do you see the issue on?
Can you upgrade your Firefox version to a more recent one and check if the issue is still there? Thanks

Comment 2

[Reuben Morais [:reuben]]

Works for me on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:7.0a2) Gecko/20110815 Firefox/7.0a2 ID:20110815042007.

Comment 3

[Mardeg]

This was also noticed at
http://hacks.mozilla.org/2011/08/rendering-3d-with-css-and-javascript-with-dom3d-guest-post/
"The most glaring problem with dom3d is the seams in the object, which appear in all browsers. Apparently there are a few bugs in rendering engines when stressing their CSS3 transforms and using linear-gradients!"

Comment 4

[Veit Lehmann]

I can reproduce the issue on Firefox 4, 5, 6 and 8.0a1 nightly (2011-08-15) on a Windows 7 machine. I will test other OS and keep you updated.

Comment 5

[Veit Lehmann]

I tested more operating systems.

Affected:
Win XP + FF5, Ubuntu 11.04 + FF5

Not affected:
Mac OS X 10.7 + FF5

Comment 6

[Cork]

Tracked it down to http://hg.mozilla.org/mozilla-central/pushloghtml?startdate=2010-12-02&enddate=2010-12-03

Suspecting bug 588271 and there through a dup of bug 591361. But i need to narrow the range more before i can tell for sure.

Comment 7

[Cork]

Reduced regression range to http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7ab0eb4c345b&tochange=ae06445eeff1

So ya, this is caused by bug 588271.

I'm going to confirm this for now.

Comment 8

[j.j.]

Isn't this a dup of bug 646053?