While editing one of my severely outdated pages I noticed one extremely annoying behavior: onclick attribute gets stripped if it's the last attribute of a tag.

Example of stripping (add this code to a page and save):

<a href="#" onclick="alert('Hey!');">Clicking on this link will do nothing.</a>

Example of not stripping:

<a onclick="alert('Hey!');" href="#">Clicking on this link will produce an alert.</a>

Considering that a lot of my links on certain pages are in form of buttons that rely on onclick attribute, quite a lot of information was lost due to me not knowing about this quirk.

I haven't tested this behavior outside of pages.