'''Verification Steps''':
* In the Developer menu turn on 'Flash repainted area'.
* Perform all common interaction interactions with the app. Look for areas of the page that are flashing but where the content hasn't changed. Here are some example:
{|
|[[File:Invalidation_demo1.gif|center|frame|Good: GIF invalidates every frame, links invalidates on mouse over because of style change. Static content is not repainted]]