I am trying to use html5 and tags and the default configuration of Tinymce3 automatically removes these tags.
The offical Tinymce3 documentation says to configure it to use html5 in the tinymce.Init{}
http://archive.tinymce.com/tryit/3_x/html5_formats.php
This must be a common problem. I have searched and not found the current answer to this issue.
This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/88941-how-to-make-tinymce-rich-text-editor-support-html5