Edit not working

[matt]

Is this on the Rich Text editor, and did you have any HTML in your post? If so, this might be the issue / solution:

Embedding HTML in posts isn’t working

You’d need to be in markdown mode, not the rich text editor. This is because markdown interpreters also parse html. Originally write.as only had markdown entry, so this didn’t need to be clarified - and presumably the docs are from back then.