`canonical.href.fragment`

Default: error
Plugin: canonical

The canonical href has no #fragment.

Why: Google ignores fragments in URLs, and asks you not to use one in a canonical URL. A fragment there is often a copied link to a section, such as #top.

When off: canonical links with a fragment pass.

<!-- ✗ Fails -->
<link rel="canonical" href="https://example.com/about/#team" />

<!-- ✓ Passes -->
<link rel="canonical" href="https://example.com/about/" />

References

Google: How to specify a canonical URL: "Don't specify a URL fragment as canonical."
Google: URL structure: Google generally does not support URL fragments.