496315 - Table with cells with certain percentage columns is not rendered full-width (without specifying the width)

Status: REOPENED

(Core :: Layout: Tables, defect)

Description

[Niek Kouwenberg]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)

I defined a table with the following columns: (no width), 52%, 16%, 16%, 16%. In most cases, such a construction will make the table full-width (when "width: auto;"), except for 16% percent columns, or 8%.

Reproducible: Always

Steps to Reproduce:
1. Create a table without setting a width (thus width: auto;)
2. Add a table cell with no width set.
3. Add 3, 4, 5 or 6 table cells with a width of 16%
4. Add one cell to make a total width of 100%
Actual Results:  
The table is not full-width, but really small.

Expected Results:  
A full width table.

If I use a width of anything other than 16% or 8% (not tested them all), the table renders full width. Even when using 1 or 2 16%-wide columns, the table is rendered full width.

Comment 1

[Niek Kouwenberg]

Attachment: Testcase for 16% width, showing the rendering issues

Comment 2

[Bernd]

happens on trunk too

Comment 3

[Bernd]

same cause as https://bugzilla.mozilla.org/show_bug.cgi?id=490643#c14

Comment 4

[Bernd]

the patch in bug 490643 fixes this, its basically the same issue, columns adding up to 100%, do not trigger the expansion due to float machine rounding errors.

Comment 5

[Cosmin Muntean [:cmuntean], Ecosystem QA]

The test case from bug 490643 no longer reproduces the issue, but the one from this one does.