13. Test for Heading Level Accessibility Issues

👍 Every page should contain exactly one <h1> heading.
The primary heading should be followed by <h2>, <h3> in order. It's bad practice for your webpage to simply feature <h5>, <h6>!
Headings are not just for styling (and font size); they also carry a semantic role!
Use react-axe or tota11y to diagnose. You can always check which headings are available in the VoiceOver rotor, headings menu.