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Last Comment Bug 458033 - Large rowspans stretch tables vertically
: Large rowspans stretch tables vertically
: testcase
Product: Core
Classification: Components
Component: Layout: Tables (show other bugs)
: Trunk
: x86 Linux
: -- normal (vote)
: ---
Assigned To: Nobody; OK to take it and work on it
Depends on:
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Reported: 2008-10-01 06:34 PDT by Matthew Wakeling
Modified: 2008-10-02 23:27 PDT (History)
0 users
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Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

testcase from url (24.95 KB, text/html)
2008-10-02 23:23 PDT, Bernd
no flags Details

Description Matthew Wakeling 2008-10-01 06:34:58 PDT
User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/2008071420 Iceweasel/3.0.1 (Debian-3.0.1-1)
Build Identifier: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/2008071420 Iceweasel/3.0.1 (Debian-3.0.1-1)

When rendering a table with style border-collapse: separate, cells seem to have a minimum height of the content plus some small amount per rowspan. This becomes a problem when trying to make two columns have slightly differing numbers of rows by using lowest common multiple rowspans, as shown in the first table in the example web page.

I know this is an obscure problem, but it may exhibit itself in undesirable behaviour in other situations. If you set border-collapse to collapse, then the problem goes away.

Reproducible: Always

Steps to Reproduce:
1. Create a table, and set the style border-collapse to separate (the default).
2. Have a row that has a large rowspan, and no other cells forcing the size of the row.
Actual Results:  
The table is very large vertically.

Expected Results:  
The table should be no larger than if the rowspan was one.
Comment 1 Matthew Wakeling 2008-10-01 06:37:56 PDT
It seems that the amount of vertical space added to the rows is non-linear. Three data points are:

Rowspan = 1, row height = 21 pixels
Rowspan = 20, row height = 36 pixels
Rowspan = 50, row height = 96 pixels
Comment 2 Bernd 2008-10-02 23:23:11 PDT
Created attachment 341589 [details]
testcase from url
Comment 3 Bernd 2008-10-02 23:27:35 PDT
this depends both on the cellspacing and the cellpadding. Both of them default to 1px. Setting them explicitly makes the problem more obvious.

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