133021 - embed tag with hidden attribute does not hide properly

Status: RESOLVED DUPLICATE of bug 136456

(Core :: Layout, defect, P4)

Description

[Jacob Eisinger]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.9+)
Gecko/20020318
BuildID:    2002031803

An embed tag with a hidden attribute displays a transparent box moving all
content below it.  An example of the tag is:
<embed src="file.midi" hidden="true">

Reproducible: Always
Steps to Reproduce:
1. View a page with a embed tag with the hidden atribute


Actual Results:  All the content is moved down below an invisible box that the
embed tag created.

Expected Results:  The embed tag should not have rendered anything on the
screen.  The content should have been been moved up.

See attachment of the test case.

Comment 1

[Jacob Eisinger]

Attachment: embed tag with hidden atrribute

Comment 2

[Christopher Hoess (gone)]

The <embed> tag is not standard HTML, nor is the "hidden" attribute.  Hiding it with CSS should be effective.  Should probably be WONTFIX or INVALID.

Comment 3

[Jacob Eisinger]

Maybe this topic should be another bug, but on my computer the sound is not
played.  I always assumed that it was because a helper application on my
computer was not set up correctly; but, if mozilla does not support the embed
tag (and that is the reason why their is not music on the web page), then
mozilla should ignore it and not display anything regardless of the fact that
their is a hidden attribute or not.

Am I understanding everything correctly?

Comment 4

[Christopher Hoess (gone)]

I think <embed> may be necessary for IE; we may support it too, for
compatibility.  Try wrapping the <embed> tag in an <object> tag with the
appropriate attributes: data="location of file" and type="MIME-type of file",
and I think it should work.  

You are correct that the "hidden" attribute should not affect Mozilla's handling.

I'm going to resolve this bug; the above solution should make the object
invisible, anyway.  Good luck!

Comment 5

[Boris Zbarsky [:bzbarsky]]

Um...  I'm sorry, but I disagree.  Reopening.

We _do_ handle the "hidden" attribute.  We map it to "visibility:hidden" in CSS.
 Unfortunately, both IE and NS4 act more like "height:0; width:0" (or maybe even
"display:none") in response to that attribute.

This should be fixed, imo.

Comment 6

[Christine Hoffman]

Changing QA contact

Comment 7

[Kevin McCluskey (gone)]

Looks like a ObjectFrame - plugin issue. Reassigning to peterl.

Comment 8

[Peter Lubczynski]

Nope, this is broken :( Patch in bug 136456 will fix this.

Note: We don't map it to visibility as according to CSS spec this leaves space
in layout while the hidden attribute acts more like display:none in 4.x. We
can't use display:none at this time because plugins are tied to frames.

Does anyone know if I.E. or 4.x support the hidden attribute on applet tags?

*** This bug has been marked as a duplicate of 136456 ***