269327 - Absolutely positioned <p> is offset by 16px

Status: RESOLVED INVALID

(Core :: Layout: Positioned, defect)

Description

[Gérard Talbot]

When I absolutely position a <p> at top: 84px, it is positioned at 100px in the
root element. I can't explain this.

Reduced testcase coming.

Comment 1

[Gérard Talbot]

Attachment: Reduced testcase

Actual results in Mozilla 1.8a5 build 2004110905 and Firefox 1.0 final release
rv: 1.7.5 build 20041107: the <p> is positioned at 100px from the top edge of
the html element.

Expected results: the <p> should be positioned at 84px from the top edge of the
html element.

Note that both MSIE 6 SP2 SV1 and Opera 7.60 beta 2 position the <p> at 84px
from the top edge of the html element.

Comment 2

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

P has a UA-default vertical margin of 1em.

Comment 3

[Gérard Talbot]

Yes, you are right (<grunt>I never suspected/thought about a vertical
margin</grunt>). OTOH,
"'margin-top', 'margin-bottom' 
Initial:  	0"
http://www.w3.org/TR/CSS21/box.html#margin-properties

Comment 4

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

*** This bug has been marked as a duplicate of 33784 ***

Comment 5

[Gérard Talbot]

Appendix D. Default style sheet for HTML 4.0 of CSS2.1 
http://www.w3.org/TR/CSS21/sample.html
gives
p {margin: 1.12em 0;}
and no margin for div. 

Also, margin is 0 (for <p>) when the document triggers quirks mode.

Resolving as INVALID