I knew had I heard it before but I must have completely missed it anyway and forgotten to test my new Javascript widget in IE. None of the stylesheet worked in IE and it didn't make any sense. Here's how I did it first:

 var closer = document.createElement('a');
 a.setAttribute('style', 'float:left; font-weight:bold');
 a.onclick = function() { ...

By blogging about it I can pretty much guarantee that someone will comment and say "Hey, why didn't you use the pypi/alreadyexists package which does the same thing but better". I couldn't find one after a quick search and I felt the hacker mood creeping up on my begging me to (re)invent it.