Hello,
I have noticed that TinyMCE is stripping out form elements from the source code. I have checked to see if this is done within TinyMCE and have tried the fixes I came across. (setting verify HTML to false, and adding to valid_elements) but neither of these seemed to work.
Is there something SilverStripe specific that is causing form elements to be stripped out of the HTMLEditField that I am not aware of?