Heading hierarchy (heading)
Use semantic heading tags or ARIA heading roles in a logical hierarchy
Skipped heading tag in hierarchy:
In this example there is <h2> element skipped in hierarchy:
Main Title
Introduction content.
Subsection
Details about the subsection.
The (DOM/programmatic) structure of the above example looks like this:
<h1>Main Title</h1>
<p>Introduction content.</p>
<h3>Subsection</h3>
<p>Details about the subsection.</p>
<p>Introduction content.</p>
<h3>Subsection</h3>
<p>Details about the subsection.</p>