@imron -- yes on the javascript filtering. As your posts showed, it was getting through in some of your comments before. That was a case of comments not being properly filtered and has been corrected.

The filtering happens when the content is saved into our database. This means it's possible to insert javascript into your own lesson while you're building it, but it will be removed before being saved on the server. So user-added scripts will never be served out to anyone else.

Main goal of handling things this way is to keep the editing features responsive. No real need to make people wait for the server to save content in most cases. One exception is when we save annotated texts, and because of the complexity of the changes involve wait for confirmation edits have been properly saved before continuing.