Quick answer

Use a single meaningful <main> landmark for the page’s dominant content when the document has a normal content structure. It helps assistive-technology users navigate, but a missing landmark is an accessibility and structure review—not an automatic SEO failure.

What the issue means

A main landmark identifies the primary content area separately from navigation, headers, complementary content, and footers. In HTML, the semantic <main> element is usually the clearest implementation.

Why it matters for SEO

The main benefit is document clarity and accessibility. Better structure can support usability, but NOTABIS does not claim that adding <main> alone improves rankings.

How NOTABIS detects it

The missing-main-landmark rule checks whether a main landmark is present in the measured document. It does not perform a full accessibility audit or judge whether every landmark is correctly labelled.

How to check it yourself

Inspect the DOM for <main> or an equivalent main landmark. Test keyboard navigation and, where possible, use an accessibility tree or screen reader to confirm that the dominant content is discoverable.

How to fix it

Wrap the page’s primary content in one <main> element. Keep navigation, repeated headers, and side content outside it where appropriate. Avoid adding multiple competing main regions to silence a count-based finding.

When it may be intentional

A fragment, embedded document, feed response, or non-HTML endpoint may not have a normal page landmark structure. Treat those separately from public content pages.

Related issues

Review H1 headings, duplicate main landmarks, empty headings, and unlabeled form controls.

Run a NOTABIS audit

Use the affected-page evidence to decide whether the missing landmark occurs on real content pages or on intentional utility responses.