To assess desktop views, we recommend using Firefox with the provided bookmarklets, and Lighthouse or Deque Axe DevTool as an automated testing tool. For PDFs, and other documents, simply answering the provided questions should be sufficient.
Wherever possible try to run these checks across different hardware (MacOS, Windows, iOS, Android) and browser (Chrome, Firefox, Edge, Safari) combinations.
When testing mobile apps, we recommend also using a screen reader, such as VoiceOver on iOS or Talkback on Android.