Canonical URL
A single, absolute, in-<head> <link rel="canonical"> (and/or Link header) pointing at the preferred URL. (page-parsed)
Broken variant
Five conflicting canonicals: relative, a second differing target, cross-origin, mailto:, empty href, and one in <body>.
Catalogued flags
| Flag | Kind | Severity |
|---|---|---|
canonicalEmptyHref | defect | medium |
canonicalOutsideHead | defect | high |
canonicalConflicting | defect | high |
canonicalInvalidUrl | defect | medium |
canonicalRelative | informational — fails nothing | — |
canonicalCrossOrigin | informational — fails nothing | — |