Sumamry says it all really, changing style.display or style.position of an iframe with designMode on causes designMode to turn off. I'll attach a testcase which walks you through thw two main problems. This is /almost/ able to be worked around (by turning it back on), but it means that any selection in the designMode on iframe is lost (not the content of the selection, just the selection (hilite) itself). Unfortunatly I can't find a way to grab selection, turn off designMode, do the style change, turn on designMode and reselect the previously selected text.

With trunk build 20050110 on Win XP, the designmode stays when clicking the first button, but lost on the second (position:relative)

The first button actually does absolutely nothing in a current build, since the display is not changed when all is said and done. That's why it doesn't cause any problems. For the rest, a frame reconstruct will destroy the presshell in the iframe. It sounds like Midas doesn't deal with that very well. Note that selection will definitely get destroyed with the presshell, so that will be a problem even if this bug is fixed....

Same testcase as before, but now both ways cause designMode not to work anymore (as already described in this bug and testcase).

Also turns off when changing visibility.

This was fixed by bug 284245.

https://bugzilla.mozilla.org/attachment.cgi?id=175929 is now working fine for me using build Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050628 on Windows XP Seamonkey trunk. Verified FIXED

I'm using deerpark from July 12 and when I use a RichEdit I can only type if there is text already. and I have to click on a line that has text. if there is no text, there is no where to click.

Mathieu Jobin, that doesn't sound like it's related to this bug at all. Please file a new bug on that, ok? One bug per issue.