Checkpoints - Do not have multiple headings with identical text
Headings give structure to a web page. This structure is both visual and technical, meaning that a human can see it (or hear it, more on that later) and a machine can understand it. This structure is like an outline of the page. Descriptive headings allow screen-reader and assistive technology users to skim the structure of a page and navigate to or skip over sections. Identical headings make it more difficult for user to navigate through the site efficiently.
Use headings for:
The structure of page content
Sections and sub-sections of an article
Any other consistent sections that users may want to find or skip
Accessibility (WCAG 2 Level AA, 2.4.6)
The checkpoint examines the entire HTML source code of a page and reports if any of the header elements are identical.