Bug 285414 – table border disappears when colspan=0 and border-collapse: collapse

• Status: NEW
• Component: Tables

[Karl Dubost]

Created attachment 473791 [details]
rendering in safari, firefox, chrome

1. Go to https://codepen.io/webcompat/full/KwPZdEK
2. Check the last example with the title: "simple table width border=1 / colspan=0 + border-collapse:collapse"

Result the second and third column seemed to have been cut off. 
Compare with other browsers (which seems wrong too in a subtly different way too)

[Karl Dubost]

The simplified test case

<table border="1" style="border-collapse:collapse">
  <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>

[Karl Dubost]

Probably the rendering should be like 

<b>simple table width border=1 / colspan=3 + border-collapse:collapse</b>
<table border="1" style="border-collapse:collapse">
  <tr><td colspan="3">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>

[Radar WebKit Bug Importer]

<rdar://problem/142403322>

[Karl Dubost]

Created attachment 473962 [details]
rendering in safari, minibrowser, firefox, chrome

This is the rendering for (from left to right, top to bottom)

Safari Technology Preview  211          20621.1.9.111.1
Firefox Nightly            136.0a1       13625.1.19
MiniBrowser with my patch for rowspan=0 Bug 185341 (probably will be in STP 212)
Google Chrome Canary       134.0.6969.0  6969.0

We can see that the external border in the case of colspan is not drawn for Safari/Minibrowser in the case of "colspan=0"



PS: There is another difference which is in between colspan and rowspan behavior but which is identical for all browsers see Bug 285415

[Karl Dubost]

This is probably related to https://searchfox.org/wubkat/search?q=symbol:E_%3CT_WebCore%3A%3APaintPhase%3E_CollapsedTableBorders&redirect=false