258255 - offsetLeft property of table element wrong when table centered with align="center" or with CSS

Status: NEW

(Core :: DOM: Core & HTML, defect, P5)

Description

[Martin Honnen]

I will upload a test case where Mozilla (tested with Mozilla 1.8a3
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8a3) Gecko/20040906)
returns 8 for the offsetLeft property of a table element that is centered on the
page with <table align="center"> and is therefore in a window with a width of
about 800 pixels offset by about 150 pixels. 
As there is no standard for offsetLeft the implementation should follow the IE
implementation and IE shows a value much higher than 8.

Comment 1

[Martin Honnen]

Attachment: test case showing offsetLeft of 8 where table is offset by about 150 pixels (if window width is about 800)

Comment 2

[Martin Honnen]

Attachment: another test case showing offsetLeft problem, table in this case centered with CSS

Comment 3

[Bernd]

the dom probably queries the outer table frame but should ask the inner

Comment 4

[Boris Zbarsky [:bzbarsky]]

We're probably looking at the offset of the table-outer frame, not the inner
frame...  Some testing would need to be done on whether we can always just look
at the inner frame for the table (that is, we need a clear description, with
testcases, of what IE does for tables with offsetLeft).

Comment 5

[Martin Honnen]

Attachment: IE 6 screenshot of http://bugzilla.mozilla.org/attachment.cgi?id=158098&action=view

Comment 6

[Martin Honnen]

Attachment: IE 6 screenshot of http://bugzilla.mozilla.org/attachment.cgi?id=158099&action=view

Comment 7

[Martin Honnen]

Attachment: further test case that has three tables for the three different alignments

Comment 8

[Martin Honnen]

Attachment: IE 6 screenshot of http://bugzilla.mozilla.org/attachment.cgi?id=158184&action=view

Comment 9

[FataL]

Attachment: Test case showing that not only align=center causing a problem with offsetLeft in table

Comment 10

[Mihai Bazon]

The problem is more general; it's related to tables having margin styles set.  Example: <table style="margin-top: 10px; margin-left: 20px"> -- this will make offsetLeft report a 10px smaller value, and offsetTop a 20px smaller value.

The <table>'s align attribute is implemented in terms of CSS using float-s and margin-s. (see res/html.css).

It's kind of annoying so I'm voting for this bug...

Comment 11

[José Jeria]

*** Bug 319874 has been marked as a duplicate of this bug. ***

Comment 12

[Ioana (away)]

Mozilla/5.0 (Windows NT 5.1; rv:29.0) Gecko/20100101 Firefox/29.0 (20140113030203)
It seems the implementation for this changed. On Nightly, I get offsetLeft: 197 for the first two testcases, while Chrome gives 195 and IE 206.

For the third testcase, Firefox gives offsetLeft 8, 273, 548,
IE 8, 244 and 491,
Chrome 8, 233, 468.

The fourth testcase shows offsetLeft 208 on all three browsers.

All other offsets (non-left) have the same values on all three browsers.

Is this change by design? Is there anything that still needs investigating here?

Comment 13

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.