mgeiser,
CuteEditor has the code to remove javascript automatically, but it doesn't have code to auto clean up the html code. Most of the above cleanups are done by browser.
For example:
<div style="color:red">Hello Worls</div> will work in Firefox.
But
<div style="colorR:red">Hello Worls</div> will not work in Firefox. And the code will be cleaned automatically.
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