- Class
- C3 Standard
- Weight
- 2
- Severity on fail
- minor
- Applies to
- the HTML Standard
Test this rule on a live site with the title tag checker. Free, no account needed.
Scope and evidence
Evaluated on page (P). The book marks this requirement STANDARD.
Fail conditions
Each condition has a stable code and a reason template. The evaluator fills the placeholders from observed values only; no sentence in a report is generated.
multiple{url} contains {n} <title> elements. The HTML Standard allows exactly one in the head of an ordinary document.
The documented fix
Remove duplicate title elements; render the title from one template slot.
Sources, quoted
These are the passages the rule rests on, stored once in the knowledge base and emitted exactly as written. A citation marked for specific conditions appears only on findings with those codes.
“One or more elements of metadata content, of which exactly one is a title element and no more than one is a base element.”
[WHATWG-SEM] HTML Standard: 4.2 Document metadata (and 4.1 The document element) · The head element (content model) · last updated Living Standard
https://html.spec.whatwg.org/multipage/semantics.html