281953 - rogue horizontal line rendered below image with (0 < opacity < 1), for some combinations of font-size, position, top

Status: RESOLVED WORKSFORME

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[Karl Johan Kleist]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

The provided minimal test case results in the provided screenshot.

A thin, horizontal line is rendered below the image if:

- the body has style "font-size: 76%" (but not 75 or 77)
- the paragraph containing the image has style "position: relative"
  and "top: 3em" (or 4em, or 5em; but not e.g. 2em or 6em)
- the paragraph containing the image has other "opacity" than 0 or 1

Could this be related to bug 274591 ?



Reproducible: Always

Steps to Reproduce:

Comment 1

[Karl Johan Kleist]

Attachment: minimal test case

Comment 2

[Karl Johan Kleist]

Attachment: screendump showing rogue horizontal line below image

Comment 3

[Boris Zbarsky [:bzbarsky]]

Please test a current trunk build...  You're using a layout engine from early
April 2004...

Comment 4

[Karl Johan Kleist]

Attachment: minimal testcase

new testcase referring to correct bug id

Comment 5

[Karl Johan Kleist]

Attachment: screendump showing rogue horizontal line below image

new screendump referring to correct bug id

Comment 6

[Karl Johan Kleist]

[Sorry for spamming you all... ]

Boris, thanks for your point. I have now tried this build:

"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050211
Firefox/1.0+" downloaded from here:

<http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/firefox-1.0+.en-US.win32.installer.exe>.

And yes, I can still reproduce the weirdness (which smells rounding error,
doesn't it?).

Comment 7

[Hermann Schwab]

Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.8b) Gecko/20050211

I´m seeing this too. When I switch to another tab and return, the underline may
be reduced to two points just there where the vertical borders of the image
would cut the line. I opened composer on that testpage and saw it too in
composer. I saw some changes working, and then it wasn´t reproducable.
I duplicated the <image ..> and saw two images, each one having its underline.
I minimized composer and dragged it to top left corner, then dragged the lower
right edge up and down, hovering over the testcase image in Mozilla.
The underline was sometimes destroyed, sometimes repainted, depending maybe on
speed or some other timing. I then noticed the first (original) image in the
composer window has lost its underline, the image to the right still had it.

Comment 8

[Daniel O'Connor]

*** Bug 286190 has been marked as a duplicate of this bug. ***

Comment 9

[Anne (:annevk)]

Confirming as a valid bug. Looks strange indeed and the problem seems to be very
specific.

Comment 10

[Micah Bucy]

This bug is non-existent on branch Build ID: 2006011112, i'm guessing it's been fixed on trunk by now?

Comment 11

[Rob Marshall [tH]]

WFM in Windows Firefox 1.5 and 20060520 Trunk (cairo).