Repro steps: 1. Given the following html: <div contentEditable><table><tr><td>1</td><td>2</td><tr><td>3</td><td>4<br><br></td></tr></table></div> (note the BRs, they matter) 2. But cursor on empty line in the last table cell 3a. Hit backspace/delete 3b. Hit delete/forward delete Results: 3a. Nothing happens 3b. Another br is inserted Expected Results: 3a. br is removed 3b. Nothing happens. Certainly, content shouldn't be added :) Seen in webkit nightly r55168, but I suspect it has been around for a while, since I also see it in Chrome 5.0.317.2, which is webkit r54340.
I think Roland said he would look at table bugs.
https://bugs.webkit.org/show_bug.cgi?id=35632 causes behavior 3a and should be fixed by the patch submitted there. Behavior 3b is unaffected by that patch, however.