155106 - iframe sometimes transparent even though it has no background set

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect, P4)

Description

[Jesse Ruderman]

Steps to reproduce:
1. Load the testcase. (You might have to save it to disk.)
2. Reload a bunch of times.

Result: iframe background is sometimes transparent, sometimes opaque (white).
Expected: the iframe background should always be opaque, because the iframe
content doesn't specify that it is transparent.

According to Hixie in bug 154957, this bug doesn't occur on Linux.  I see it on
Windows XP on about 50% of reloads.

Comment 1

[Jesse Ruderman]

Attachment: testcase

Comment 2

[Tuukka Tolvanen (sp3000)]

Reproduced bug on linux trunk cvs 2002-06-30. Sometimes it seems to get stuck in
either opaque or transparent 'mode' for an unlikely long time (like 20 repeats)
for it to be random; sometimes it changes on nearly every reload... go figure :)

Comment 3

[Robert O'Callahan (:roc) (email my personal email if necessary)]

The expected behavior is that the IFRAME should always be transparent. I suspect
is with someone using uninitialized data...

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

This does occur on Linux for me.

Comment 5

[Hixie (not reading bugmail)]

http://www.hixie.ch/tests/evil/xml/010.xml seems to show a similar problem. Is
it the same one?

Comment 6

[Joe M]

Attachment: transparency rendered on opaque iframe

the problem described by the description (that is, transparency on an iframe
when no transparency is defined) is also a problem.

Comment 7

[Joe M]

real-life example at http://arstechnica.com/etc/subscribe/premier-agreement.html

Comment 8

[Aaron Kaluszka]

Joe: that is not a bug.  See bug 154957 for details.

Comment 9

[Jesse Ruderman]

Marking WFM because the change bug 154957 refers to makes this irrelevant.