Screen flicker
PDFs should not have animations or scripts that make the screen flicker. This can cause seizures for users who have photosensitive epilepsy and can make the document much more difficult to interpret for users with low vision or cognitive disabilities. If there are animations or scripts that make the screen flicker in a document, remove the animations and scripts in order to pass this check.
WCAG requirement: 2.3.1 Three Flashes or Below Treshold