WYSIWYG editor

You could use
queryCommandState("bold") to get the state of commands which only have on and off and
queryCommandValue("fontsize") to get the value of commands which has more than one option.

I was building a bit more complicated solution using TextRange and parentElement() to find out the tags, that would have been perfect if it wasn't for the very strange and buggy behavior that moveToElementText() function is displaying..

Your functions was a lot easier to use and seems more reliable, but is there any way to detect eg images and hyperlinks with them? (or something else) They worked great on bold,italic,underline,font etc, but I haven't found any solution for non-text-stuff

Well, im working on my own wysiwyg editor, and i've the same problem. Im working on it, and will return here, if i find a solution.

please take a look on the following editor (crossbrowser)
http://tinymce.moxiecode.com/