Labels
SC 2.4.6 - What does "Headings and Labels" mean?
You open a page and the first heading is “Overview”. Overview of what? You scroll and find “Details”, “More information” and “Other”. Not one of them tells you what is in the section. You have to read everything to find out what the page is about.
SC 3.3.2 - What does "Labels or Instructions" mean?
You open a form with five fields. No labels, just grey example text that vanishes the moment you start typing. Halfway down you no longer remember what the first field wanted. A couple of fields have an asterisk and nothing on the page says what it means.