If an <option>, <tbody>, <thead>, <tfoot>, or <tr> appears in a table and there is no corresponding end tag then the content model gets messed up if there are subsequent table related elements. Extra nested tables get created. The following illustrates the case where </tr>s are missing. This was run with a 2/27 am NT build. I filed a bug a few days ago for the case of a missing <tbody>, but this is getting serious enough to warrant another bug. <table border=1> <tbody> <tr><td>tbody-1 cell-1<td>tbody-1 cell-2 </tbody> <tbody> <tr><td>tbody2 cell</tr> </tbody>

reassigning QA Contact to Germaine.

I'm adding Troy's comments from bug 3436 and marking that one a duplicate of this. The very bottom example of test4 isn't displaying correctly, because the collapsed version of the table is getting incorrectly nested inside the previous table. This small subset of HTML demonstrates the problem. If you add </tr> to each line (eight places), then it's not nested and it displays okay. <P> The following table will have its 1st row group collapsed (rows 1 and 2) <BR> <table cellspacing=0 border=1 style="background-color:orange;"> <caption><b>before</b></caption> <tbody style="background-color:red;"> <tr><td>C11<td>C12<td>C13<td>C14 <tr><td>C21<td>C22<td>C23<td>C24 </tbody> <tbody> <tr><td>C31<td>C32<td>C33<td>C34 <tr><td>C41<td>C42<td>C43<td>C44 </tbody> </table> <BR> <table cellspacing=0 border=1 style="background-color:orange;"> <caption><b>after</b></caption> <tbody style="visibility:collapse;"> <tr><td>C11<td>C12<td>C13<td>C14 <tr><td>C21<td>C22<td>C23<td>C24 </tbody> <tbody> <tr><td>C31<td>C32<td>C33<td>C34 <tr><td>C41<td>C42<td>C43<td>C44 </tbody> </table>

*** Bug 3436 has been marked as a duplicate of this bug. ***

Fixed by improvements to elementtable.