117419 - hovering on list of links moves the bullets

Status: RESOLVED INVALID

(Core :: Layout, defect)

Description

[Devoti Paolo]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.7+) Gecko/20011228
BuildID:    2001122803

hovering on list of links text is bolded but it does not change in height  and
the text does not move while are moving the bullets

Reproducible: Always
Steps to Reproduce:
1.open url
2.hover on links

Actual Results:  bullets are moving while the text is not

Expected Results:  bullets steady as the text is

Comment 1

[gavin long]

The effect is tied to the use of the Courier New font, and changing the <a> text
to bold when you hover the mouse.  Testcase to follow.

I suspect that this may be a duplicate.

Comment 2

[gavin long]

Attachment: reduced testcase

Comment 3

[Håkan Waara]

I don't think this is a bug. The bullets 'move' because the hover effect (bold)
makes them take up more space.

Another testcase would be to change font size on hover -- that will move the
bullets even more.

Suggesting wontfix/invalid.  What do you say bz?

Comment 4

[Devoti Paolo]

Attachment: closer to what I was talking about

The bullet and the text should move or not together.
Only the bullets are moving.
line-height: 15pt => no height change bold or not. Isn't it?

Comment 5

[gavin long]

Heh.  This should confuse things a bit.  

On Win98, 0.9.7 (2001122106), my testcase
(http://bugzilla.mozilla.org/attachment.cgi?id=63058&action=view) DOES NOT show
the "problem"

On Win98SE, 2001122803, it does.

[e-mail]'s test case
(http://bugzilla.mozilla.org/attachment.cgi?id=63069&action=view) looks the same
on both.

Comment 6

[Devoti Paolo]

I get the same behaviour from withing win98 and win2k.
The differences between the two testcase are line spacing and underlined text
for links. The line gets doubled when bolded, the bullet is always the same.

And have an happy new year!

Comment 7

[gavin long]

curiouser and curiouser...

BOTH testcases now WFM (win98SE, 2002021503)

I still have a problem with the main URL though - the bullets stay put, but the
headers further down the page jiggle about.

Comment 8

[Devoti Paolo]

Attachment: better testcase

Comment 9

[Devoti Paolo]

The same behaviour is now hitting different part of original url.
Hovering on right links column bounce the central image. 

Comment 10

[Devoti Paolo]

still real win98 2003051408

Comment 11

[Christopher Hoess (gone)]

The "bouncing of the central image" is an artifact of the page design, not a
Mozilla problem. The page contains a table of three rows. The first row contains
the two columns of lists and the top image, the second the central image, and
the third the page footer. As best I can make out, when the lists are hovered
over, the first row expands in size. This pushes down the lower rows slightly,
shifting the central image and the footer.

Looking at "better testcase", the first two lists expand slightly on hovering,
the bullets and text moving together. There is no movement of the header or
otherwise when hovering over the second two lists.

As far as I can tell, everything is in order. (Win XP, build 2004012709). Could
someone check on Windows 98 to verify this and resolve the bug?

Comment 12

[Devoti Paolo]

In my understanding the bold attribute should not change the line's height.
If the height change is correct then the behaviour is correct too.

Comment 13

[Boris Zbarsky [:bzbarsky]]

> In my understanding the bold attribute should not change the line's height.

Why not?  It's not uncommon for a bold font to have slightly different font
metrics from the non-bold version....

Comment 14

[Devoti Paolo]

In the "better testcase" if there is a change in height all the lines under the 
bolded one should move.
If you hoover on the last two lists nothing moves while it happens on the first 
two.

Comment 15

[Boris Zbarsky [:bzbarsky]]

Actually, I see nothing move on any of the lists (which makes me even more
certain this is a font metrics issue).  Then again, I'm testing a Linux build.

Comment 16

[Adam Guthrie]

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a1) Gecko/20051210 Firefox/1.6a1

No bullet movement here.

Comment 17

[Devoti Paolo]

verified with
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20051130 Firefox/1.6a1

The behaviour in "better testcase" is still the same with mswindows but I agree with comment #15 that the font metric is involved.

It's still a bug because of the different behavior between the first and the second part of testcase. Only after "paragraph is the borderline" nothing moves while fonts are the same in the whole page.

Comment 18

[Devoti Paolo]

works properly with firefox 3 beta 2

Comment 19

[Mats Palmgren (inactive)]

Attachment: Testcase #4

Comment 20

[Mats Palmgren (inactive)]

I can reproduce this in Nightly on Linux, using Testcase #4 I see the text moving for the 10px, 15px and 20px sizes when hovering the text.
As noted above, if and when this occurs depends on font metrics and isn't a bug per se. (There are various ways for authors to avoid this.)