ARO · Operational

Semantic HTML

Semantic HTML is an Agent Readiness Optimization check in the Content group.

Version agent-readiness-2026-10

What is this benchmark?

Semantic HTML is an Agent Readiness Optimization check in the Content group.

Why it matters

A main region and a heading tell an agent where the page content starts.

How SiteGlue evaluates it

HTML and structured markup on the public page. Spec: https://html.spec.whatwg.org/multipage/sections.html. Catalog agent-readiness-2026-10.

Passing criteria: The published signal for Semantic HTML is present and readable.
Failing criteria: The scan requested the signal and it was missing, blocked, or malformed.
Not verified: The check was not selected, the probe did not run, or evidence was inconclusive. Not verified is never scored as 0.
Not applicable: Not applicable when the business has no corresponding surface (for example commerce protocols on a site with no cart).

Scoring weight: 1. Evidence: Public HTTP, HTML, or DNS evidence for Semantic HTML. No private credentials.

Example results

Pass

Agents can read a valid Semantic HTML signal on the public site.

Fail

Semantic HTML is missing, blocked, or not machine-readable.

Recommended fixes

Put the page content in a <main> region and give the page one <h1>. The platform does not rewrite the site template.

Related benchmarks

Frequently asked questions

Does a missing optional check lower my ARO score?

Yes, if the check is applicable and failed. Not verified items are excluded.

No. ARO is a website audit. Optional live walks are Test With AI Agents.