120280 - content of links with CSS replaced by garbage after mouse over

Status: RESOLVED WORKSFORME

(Core :: Layout, defect, P3)

Description

[Chu Alan #2]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.7+) Gecko/20020115
BuildID:    2002011508

After the mouse move over the link and trigger a:hover, the link does not render
the CSS properly and become garbbage.

It seems like the issue is not solely caused by CSS as it has specific HTML
combination to trigger it, and this may have something to do (or even a dup) of
some previous bugs ... but i am unable to find those bugs :)


Reproducible: Always
Steps to Reproduce:
1. Open the testcase
2. Put mouse over the link at the bottom of the page
3. See the link become random garbbage


Actual Results:  Link replaced by rubbish

Expected Results:  Link changed according to a:hover.

Comment 1

[Chu Alan #2]

Attachment: reduced testcase

Comment 2

[Chu Alan #2]

Forgotten to mention that the document validates as HTML 4.01 Transitional and
no warning or error is generated with CSS validator using CSS2 and all warning
turned on.

Comment 3

[Christopher Aillon (sabbatical, not receiving bugmail)]

WFM Linux 2002011608.

Comment 4

[Olav Vitters]

Attachment: Screenshot #1

Comment 5

[Olav Vitters]

Attachment: Screenshot #2

I've downloaded a new build (2002011608) and tested it again. This time it
doesn't look as ugly as screenshot #1.

Comment 6

[Chu Alan #2]

Any idea why this happens ??

Comment 7

[Chris Petersen]

I can't reproduce this issue either on the Linux Jan 18th build (2002-01-18-06).
Tested under Redhat 6.2.

Comment 8

[Chu Alan #2]

the bug is still here (build 2002011821/Linux).

Comment 9

[Christopher Aillon (sabbatical, not receiving bugmail)]

Hmm, try with a new profile?  I still can't reproduce that on a linux CVS build
from yesterday.

Comment 10

[Chu Alan #2]

I have removed the whole ~/.mozilla/ ... but the bug is still there ...

Comment 11

[rubydoo123]

I can't repro this at all : tried windows and mac too. Used the builds from 
20020128. Marking as WFM.

Comment 12

[Chu Alan #2]

i don't see this anymore .... so strange ... ;)

Comment 13

[Tom Mraz]

I don't think this is fixed at all. I'm occasionally seeing it on many pages as:
http://www.ocworkbench.com/, http://www.zive.cz/ and other pages with a:hover
set in CSS and many links. 

I think that this issue is highly dependent on connection/loading speed. 

It sometimes demonstrates as only switching the a:hover style for the normal
style if you move the mouse fast over the links, sometimes it just doesn't apply
the a:hover style and sometimes it displays garbage when you hover the link. I
think that the worst effects are there when the page loading is slow.

I have Mozilla 0.9.9 on Linux RedHat 7.2

Comment 14

[Chu Alan #2]

ugh ... it's here again .... (can reproduce ...)

Comment 15

[Olav Vitters]

*** Bug 129426 has been marked as a duplicate of this bug. ***

Comment 16

[Chu Alan #2]

in fact anybody know why this bug happens? it seems that someone can always
reproduce it while someone cannot ...

Comment 17

[Christopher Hoess (gone)]

WFM on a current Linux CVS build.

Comment 18

[Andrew Hagen]

WFM Build ID: 2002040903 (0.9.9+) Windows 98.

Reporter, could you please try to reproduce this problem on a current nightly
build? 

Comment 19

[Sitsofe Wheeler]

Can someone look at bug 139432 which I see all the time and decide whether it's
a dup of this?

Comment 20

[Olav Vitters]

*** Bug 139432 has been marked as a duplicate of this bug. ***

Comment 21

[Olav Vitters]

The URL from bug 139432 makes this bug reproducable for me.

Using 2002-04-22-10, XFree86 4.2.0, Matrox G550, mga beta 2.0 drivers.

Corruption looks like attached screenshot #2. While the page is loading I do not
see the corruption. I do see the corruption after the page is fully loaded.

Comment 22

[Sitsofe Wheeler]

My setup is XFree 4.2.0 with NVidia 1.0-2313 Video drivers. From bug 139432:

Steps to reproduce:
1. Visit http://www.modem-help.co.uk/mfc/askey.html
2. Go to the section titled "1456VQH-R Data/Fax PCI"
3. Hover over the windows logo link or any link beneath it

Expected:
Where text was concerned, link to change colour and underline to disappear.
Where graphics are concerned, nothing.

Result:
Graphics/text become corrupted.

20020421 Linux

Comment 23

[Tom Mraz]

I can reproduce the testcase bug 139432 too.
XFree 4.1.0 and 4.0.2 with NVIDIA drivers 2313 and 1542

Comment 24

[Sitsofe Wheeler]

I have also tested this with the stock nv driver that comes with XFree 4.2.0
with the same results (20020421 Linux).

Comment 25

[Chu Alan #2]

the page that i see from bug 139432 is horrible ...

no matter where i put my mouse pointer, corruption happens, the page corrupts
when i select text there also.

XFree86 4.1.0.1, mga driver 2.0.

Comment 26

[Chu Alan #2]

sorry... using 2002041711/Debian

Comment 27

[Sitsofe Wheeler]

As I suspected this isn't Linux/X only... I can reproduce instances of
courruption on Mozilla 1.0 Windows 98.

Steps to reproduce:
1. Go to the section V1456VQH-P2 Data/Fax/Voice PCI
2. Hover over links/pictures

Expected:
Links to change colour, pictures to do nothing

Result:
Graphics corruption with what looks like elements of messed chrome appearing

Comment 28

[Sitsofe Wheeler]

Attachment: Testcase

Reduced test case of modem-help website. For corruption to show Put mouse here
link must be fully visible in

Comment 29

[Sitsofe Wheeler]

...browser window.

Unlike the original site, the testcase validates (which took me some time to do)
but Moz is still showing the bad behaviour.

This bug also shows a refresh issue when the inital problem is triggered and a
window obscures *part* of Mozilla (it does not update properly once the covering
window is removed). 

Comment 30

[Hixie (not reading bugmail)]

I can't reproduce this on Linux 2.4.8-5mdkenterprise i686 on XFree86 4.1.0,
NVIDIA drivers 1.0-1541 with Mozilla CVS tip. I can't find a pattern from the
comments given above, either. Do any of you have special configuration settings,
like in userContent.css or something?

Comment 31

[Chu Alan #2]

i am seeing the problem in 2002060621/Linux, XFree86 4.1.0.1, mga driver 2.0.

it seems like some pointer problem, since i can see some images i have
previously loaded got painted onto the link, which causes the corruption ;)

Comment 32

[Chu Alan #2]

Attachment: The `debian lock' on the corrupted link

The corrupted link showing an image which is on a page i have browsed before.

http://www.debianplanet.org/images/topics/security.png

Comment 33

[Chu Alan #2]

P.S. occasionally i have seen some similar corruption when i selects text, is it
related to this?

Comment 34

[Tom Mraz]

I'm seeing the problem on this testcase too. RH 7.2 (XFree 4.1.0, NVIDIA 2314).
Mozilla 1.0

Comment 35

[Chu Alan #2]

> Do any of you have special configuration settings,
> like in userContent.css or something?
Corruption still exists in 2002060904/Linux, clean install, newly created profile ;)

Comment 36

[Johan Dahlin]

This page looks very bad, i think it's related to this bug
http://www.thecodeproject.com/cpp/Exceptionhandler.asp

Linux/XFree 4.1.x/Mozilla 1.0 (also tested with Galeon 1.2.5)

Comment 37

[Chu Alan #2]

yea ... the page looks bad on my machine too, 2002061721/Linux, XFree86 4.1.0.1,
mga driver.

i saw a hugh black box on the page, then when i try to select the text in the
black box, it just looks odd and unpredictable ...

Comment 38

[Sitsofe Wheeler]

Hixie: how wide is your mozilla window? It's not easy to see this problem if
your window is high (I'm running mozilla 1.0 in a 1010x667 window at a res of
1024x768).

Comment 39

[Hixie (not reading bugmail)]

I tried various sizes from 800x600ish to 1200x1600ish.

Comment 40

[Tommi Lahtonen]

I seem to have similar problems with my page at:

http://www.mit.jyu.fi/tjlahton/spain-2002/

When you move mouse over the links on the page Mozilla will sometimes
duplicate the link every time you move mouse over it. It is not always 
the same link. 

Page is written in valid XHTML Basic.

Comment 41

[Martin Jacobs]

confirming on Win/Me MZ1.0.1
plse see http://www.bia.be/fr/occas.html and mouse-over 'categories' menu 
using AGP S3Inc. Savage3D 800x600px 32bit : a hardware/config problem ?  

Comment 42

[Martin Jacobs]

My #41 comment is not relevant anymore for MZ1.2 alpha new release.  
No corruption/garbage anymore.  
Still valid for Netscape 7.  

Comment 43

[Chu Alan #2]

not seeing corruptions anymore in recent builds, anybody still see the bug? i
think the bug can be closed if nobody sees the bug anymore (or bug Netscape if
the problem is still in Netscape 7?)

build ID: 2002123005, freetype enabled.

Comment 44

[Boris Zbarsky [:bzbarsky]]

Marking worksforme per comments and my testing...