Lots of tooltipped elements close together.
Mouse through them quickly and slowly.
These elements are right aligned.
One collides and one uses custom position.
collision detection should kick in around here
right aligned with custom position
These footnotes pull content form the elements they link to.
These elements load their content asynchronously.
There should be a loading message while the content is retrieved.
Play around with focusing and hovering of form elements.
Some inputs nested inside labels:
Some button widgets: