Firefox incorrectly renders table borders when zooming

[Martin Kossick]

Binary package hint: mozilla-firefox

Steps to reproduce:
1. Open Firefox
2. Go to http://kossick.de/test.htm
3. Zoom in and out (either using View -> Zoom, or Ctrl + Scroll)

Expected Result:
The table would retain its properties and still be rendered correctly, just larger or smaller in overall size.

Observed Behavior:
The borders of the table change thickness, sometimes disappearing because they get so thin.

Confirmed on:
Ubuntu 9.10 (64-bit), NVidia, Firefox 3.7
Ubuntu 9.10 (64-bit), Intel, Firefox 3.6
Ubuntu 9.10 (32-bit)
Ubuntu 10.04 (alpha 2)

[Emarwil (emarwil)]

In Firefox 3 (3.0.4 on a Mac and 3.0.2 on Linux), for a table with 1px border similar to your example, I observed that when zooming out various segments of the borders both between cells and table border itself would disappear. The same table rendered correctly in Firefox 2. As I researched this problem I ran across a posting on another site that mentioned there is an option to "Zoom Text Only".

When this feature is enabled, the table is rendered correctly. Try it for your example. I believe this is what you are looking for.

I would recommend that Firefox enable this option by default and let the user choose to zoom everything by disabling the option. This would provide consistent behavior between FF2 and FF3.

[Martijn-martijn (martijn-martijn)]

Created an attachment (id=396547)
testcase

[Martijn-martijn (martijn-martijn)]

Might be related to bug 477157.

[Tobbi-bugs (tobbi-bugs)]

*** Bug 514096 has been marked as a duplicate of this bug. ***

[Ahmed El-Mahdawy (propeng)]

Created an attachment (id=398979)
Screenshot showing 3 zoom levels

[Tanner-sumo-bugs (tanner-sumo-bugs)]

I think this would be layout: tables...

[Martin Kossick (hacktick)]

Binary package hint: mozilla-firefox

This specific table:

http://kossick.de/test.htm

should have eight equal blue horizontal borders. However, changing the size using Ctrl and the mouse wheel causes some lines to disappear or change their thickness. This happened on karmic i386 and a lucid alpha2 system in a virtual machine.

[Micah Gersten (micahg)]

Thank you for your bug report. This bug has been reported to the developers of the software. You can track it and make comments at: https://bugzilla.mozilla.org/show_bug.cgi?id=410959
I'm going to mark it as Triaged and wait for upstream to work on this. Thanks for taking the time to make Ubuntu better! Please report any other issues you may find.

[Ddascalescu (ddascalescu)]

Bump. I have a number of users annoyed about this as well. Firefox 3.6 on Windows XP SP3.

The bug has also been confirmed on Ubuntu 9.10 and 10.4 - https://bugs.launchpad.net/firefox/+bug/519928

[Moz-jeka (moz-jeka)]

*** Bug 572093 has been marked as a duplicate of this bug. ***

[Dravet (dravet)]

*** Bug 689165 has been marked as a duplicate of this bug. ***

[Dravet (dravet)]

Still broken with FF 7.

[Davisonm (davisonm)]

Bug still in FF 8 : Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20100101 Firefox/8.0

For example use http://www.somacon.com/p141.php, leave all defaults except set border-collapse to "collapse", then press ctrl-minus, note that the bottom table border disappears. Press ctrl-minus again, now the top and right borders are missing.

[Moz-jeka (moz-jeka)]

*** Bug 777708 has been marked as a duplicate of this bug. ***

[Ws-bugzilla (ws-bugzilla)]

Are there any known work-arounds? Zooming is more common than ever, especially now that high(ish)-DPI monitors are finally entering the PC market. Even IE11 does this correctly.

[Elbart (elbart)]

2014 and this is still an issue? Wow.
I'm using the zoom-feature to fix Wikipedia's awful new font-style, and now all tables on WP have missing lines. Of course, Cr and IE don't have this issue.

[Elbart (elbart)]

Trying with the testcase of comment 2, the regression-range for disappearing lines when zooming out (smaller) is

good
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2007/10/2007-10-25-04-trunk/firefox-3.0a9pre.en-US.win32.zip

bad
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2007/10/2007-10-26-05-trunk/firefox-3.0a9pre.en-US.win32.zip

http://bonsai.mozilla.org/cvsquery.cgi?treeid=default&module=all&branch=HEAD&branchtype=match&dir=&file=&filetype=match&who=&whotype=match&sortby=Date&hours=2&date=explicit&mindate=2007-10-24-01&maxdate=2007-10-26-06&cvsroot=%2Fcvsroot

Probably
Bug 389628 - "Implement UI for full page zoom" [p=dao r=mconnor r+sr=sicking (for content/events/) a=blocking-firefox3+ for M9]

===

And the range for disappearing lines when zooming in (bigger) is

Last good revision: a131999fa900 (2008-10-31)
First bad revision: 4f1383af8f10 (2008-11-01)
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=a131999fa900&tochange=4f1383af8f10

[Ws-bugzilla (ws-bugzilla)]

*** Bug 419083 has been marked as a duplicate of this bug. ***

[Gijskruitbosch+bugs (gijskruitbosch+bugs)]

*** Bug 1046390 has been marked as a duplicate of this bug. ***

[Erfa (erfa90)]

This appears to still be an issue. Very annoying not being able to zoom out without rendering the page incorrectly.

[Paul White (paulw2u)]

Bug fixed upstream over a year ago
Tested ok with Ubuntu 18.04 and Firefox 61 - https://www.somacon.com/p141.php and Wikipedia
Martin, please advise if you still see a problem
Marking as "Fix Released"