Obscured Tooltip on Hover
Some users increase the size of mouse pointers in their operating system or with screen magnification software. These should not obscure tooltip text. [Editors' Note: Possible figure to be added: hover hand obscures important tooltip text]
The following are images showing a hand cursor obscuring important tooltip text, that could be used to illustrate the issue. I created them based on UMD usability testing with students with low vision. Original samples from the video are linked on the Use case Wiki page [Laura, UC-5].