282224 - border half way outside of margin in table in collapsed border model

Status: RESOLVED DUPLICATE of bug 155955

(Core :: Layout, defect)

Description

[Benjamin Streeck]

In the collapsed-border model of tables, the width of the table is defined as
the width off all cell-widths, plus the sum of all widths of the inner borders,
plus 1/2 of the left outer border and 1/2 of the right outer border. This very
annoying fact leads to the predicament, that the border extends beyond the
margins, if the margin happens to be less then 1/2 the border.

Now, in my opinion it would have been necessary to think of this before the W3C
made this spec and include a mechanism similar to what I propose in the attached
image, an automatic addition to the defined borders that leads to the border
always being fully included inside the margins. But because I very much doubt
that such an extension would be made because some half-grown web-designer feels
that the current specs lack some thought in this case, here is another thing:

I’ve positioned a div with a ul and li inside, formatted via css to be an
inline-table, a table-row and table-cells respectively, at top:85px and
right:0px. The cells inside this table (border-collapse:collapse) all have a
border of 1px. Because of what I assume is a rounding phenomena, the top border
of the table-cells appears at top:84px – one pixel too far up -- whereas the
right border of the right-most cell appears at right:0px. This can’t be right by
any spec. Either the border should extend over the margin in both cases, and
then appear to be drawn at top:84 and right:-1 or it should lead to both borders
being drawn inside the margin and then have the element be drawn at the expected
position, a result I would expect, since as far as I know, 0.5 is usually
rounded up.

Comment 1

[Benjamin Streeck]

Attachment: Illustration of problem

Comment 2

[Benjamin Streeck]

Attachment: Testcase

Comment 3

[Benjamin Streeck]

YUI: Opera 7.54 does it in the way proposed in the testcase.

Comment 4

[Benjamin Streeck]

Attachment: Testcase better version

Comment 5

[Bernd]

*** This bug has been marked as a duplicate of 155955 ***