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Inspect the page visitors and crawlers actually receive

Website checks examine different layers: the HTTP response, page source and rendered document may not be identical. Decide whether you need to inspect a URL, validate supplied markup or preview how a browser renders a page.

How to choose your next step

Use the exact URL and inspect redirects. Distinguish public pages from authenticated or location-specific versions before comparing results.

Common questions about website tools

Why can a browser page differ from its source?

JavaScript can add or modify content after the initial HTML arrives. Server responses and client rendering should be examined separately when diagnosing missing content.

Does a passing checker guarantee search rankings?

No. A technical check answers a bounded question, such as whether a tag is present or a URL responds. It does not measure every aspect of usefulness, relevance or search quality.