WebKit Bugzilla
In the TinyMCE 2.0.3 update, a change was made that broke editing operations to selected text when performed via a toolbar button. Goto: http://tinymce.moxiecode.com/example.php?example=true Select some text, click the Bold button. The selection is blown away and nothing becomes bold. It sounds like some refactoring was done to the selection code between 2.0.2 and 2.0.3 by one of the TinyMCE contributor, which is probably where the regression was introduced. I'm filing a bug against TinyMCE now and I'll attach a link to that bug shortly.
Filed: https://sourceforge.net/tracker/index.php?func=detail&aid=1440124&group_id=103281&atid=635682
*** Bug 8811 has been marked as a duplicate of this bug. ***
It looks like this section of the moveToBookmark function is the buggy Safari-specific TinyMCE code: if (tinyMCE.isSafari) { sel.setBaseAndExtent(bookmark.startContainer, bookmark.startOffset, bookmark.endContainer, bookmark.endOffset); return true; } That should be bookmark.rng.startContainer, bookmark.rng.startOffset, etc. A bookmark doesn't have properties with those names.
I added some comments and a patch to the bug tracker for TinyMCE, but I don't know what it's going to take to get the attention of people working on the TinyMCE project.
TinyMCE says it is fixed in their CVS - someone should verify.
Verified with http://tinymce.moxiecode.com/test/examples/example_full.htm