Pretty cool, Lars!
I have two small complaints, though (aka feedback):
1) The richtext widget is treated as optional even though the "optional" element attribute is not specified...
2) The "underline" tag is by default one of the unaccepted tags, and maybe for a reason, too (underlined text is easily mistaken for a link).
I propose that we either allow the <u> tag by default in the toolkit, or that you drop that button.
/Ola