[Webkit-unassigned] [Bug 285415] New: colspan=0 and rowspan=0 do not behave the same way for rendering in all browsers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=285415

            Bug ID: 285415
           Summary: colspan=0 and rowspan=0 do not behave the same way for
                    rendering in all browsers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
               URL: https://codepen.io/webcompat/pen/dPbJGbm
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tables
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karlcow at apple.com
                CC: zalan at apple.com
        Depends on: 185341

This is not really a bug on WebKit as this is happening on all browsers. It is more a rendering difference in between colspan and rowspan.

<b>simple table width border=1 / colspan=0</b>
<table border="1">
  <tr><td colspan="0">A1</td></tr>
  <tr><td>B1</td><td>B2</td><td>B3</td></tr>
  <tr><td>C1</td><td>C2</td><td>C3</td></tr>
</table>

The cell rendering of A1 doesn't spread on all cells like it would do for colspan=3


rowspan=0 creates a joint space in both firefox/chrome (and in webkit after https://github.com/WebKit/WebKit/pull/38398) which is identical to a rowspan=n for a table of n rows.

On the other hand, colspan=0 is weird. It creates a square cell but doesn't really span it, it just removes the space remaining.

To see the difference of behavior in Safari, we need to wait the landing of Bug 185341


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=185341
[Bug 185341] rowspan="0" results in different table layout than Firefox/Chrome
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