305600 - Parent static block width miscalculated when child static block has a length-value CSS width

Status: VERIFIED INVALID

(Core :: Layout: Block and Inline, defect)

Description

[Greg K.]

When a parent block contains a child block and the child block has a
length-value CSS width (that is, some concrete length such as 10cm or 800px),
Gecko miscalculates the width of the parent block.

That is, if a parent block has width:auto and its' child has width:500px, the
parent width should never drop below 500px regardless of window width, but Gecko
incorrectly computes the parent block width as less than 500px if the window is
narrower than that.

(This seems like an awfully fundamental bug for Gecko to have at this stage in
its' maturity, so I would not be at all surprised if I have missed some
important aspect of width computation here.)

Comment 1

[Greg K.]

Attachment: Self-explanatory XHTML testcase

Comment 2

[Greg K.]

Tested on Windows Firefox 1.0.6 and Deer Park alpha 2.

Comment 3

[Mats Palmgren (inactive)]

The child widths are not part of the equation in 10.3.3:
http://www.w3.org/TR/CSS21/visudet.html#blockwidth

Opera 8 and Konqueror has the same behaviour.

-> INVALID

Comment 4

[dolphinling]

Note that the inner block overflows; that is, in fact, what overflow is all
about--when a child is wider than its parent.

Verified.

Comment 5

[Greg K.]

Okay, thanks guys.

Do either of you happen to have any links to W3 discussion about what possible
logical explanation there could have been to decide a parent static block could
be smaller than its' static children?