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HTML Guide for 403

HTTP resource not retrievable. The HTTP status from the remote server was: 403.

html
403

The validator is blocked from accessing an external resource such as a stylesheet, script, or image due to a 403 (Forbidden) HTTP status.

This means that the HTML references a resource (often in a link, script, img, or iframe element) at a URL that is denying access—possibly due to server permissions, IP restrictions, or hotlink protection. The validator needs to retrieve these resources to check them, so HTTP 403 errors will prevent validation of external resources.