This document is open to every reader on every plan. Availability tells you what a plan includes; it does not decide what you may read.
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What it is for
Every other instrument here fetches the page. This one never makes a request, which is precisely what makes it useful: it works on a staging site, on a page behind a login, and on a host that blocks automated traffic. You paste the HTML your own browser received, and it reports every document-level signal that markup carries.
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How to use it
Open the page in your browser and view its source, then copy the whole document. Copying the rendered DOM instead is also valid and answers a different question; know which one you pasted.
Paste it in and run the audit. Nothing leaves your session.
Work down the findings. They are ordered by what a crawler reads first, not by severity.
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Reading the result
Each finding is a pass, a warning or an issue against one document signal, and it quotes the markup it read. The tally at the top is a count of findings, not a score out of a hundred: this product does not issue grades it cannot defend.
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What it cannot tell you
This is the strictest boundary in the platform, and it is stated on the page itself: nothing here proves what a crawler receives. A document has no HTTP status, no redirect chain and no robots.txt, so there is no crawl verdict and no index prediction. What you pasted may also differ from what a crawler is served, which is a real difference this instrument cannot see.
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What it keeps
Nothing. The source you paste is held for the length of the request and is never written to the database.