Google Lighthouse flags all the pages without heading, skip link, or landmark region.

The system aims to find at least one of the following items while performing this audit:
- A
<header>element - A skip link
- A landmark
How to pass the audit? Improving Keyboard Navigation
To do this, it will be important to add a heading, a skip link, or a landmark to your website. To increase the UX of the user who generally uses the keyboard, do the following:
- Make sure all page content is inside the landmark element.
- Make sure you have the skip link.
- Make sure the landmark is compatible with the content in it.