First heading tag for the document must be <H1>
How to Fix the Problem
Start with an H1 tag for the main heading of your document. Then tag the remaining headings in a sequential order.
Why it Matters
When heading elements are applied correctly, the page becomes much easier to navigate for screen reader users and sighted users alike. In the same way that sighted users can glance at a page and get a sense of its contents, users of screen readers can do the same by navigating through headings. Properly tagged headings can save users, especially those who use screen readers, a lot of time and frustration.
Rule Description
Ensures that the first heading in the document is <H1>
The Algorithm (in simple terms)
Tag the main heading of your document as an H1.