All rules
warningStructure
One main landmark, one h1
A single <main> and a single h1 give agents a clean entry point for reading the page.
Score weight−8
Capability checkParse page structure
The “Parse page structure” check requires a <main> landmark and exactly one h1. Multiple h1s or a missing main make the page’s hierarchy ambiguous for traversal and quoting.
A parseable structure
<main> <h1>Agent-ready checkout</h1> <p>Intro copy…</p> </main>
See if your page fails this rule.
The audit runs every documented check and reports the ones that fail, with fixes.