Does HTML_NO_DEPRECATED_LANG_ATTR affect my score?

Yes. It is an importance 4 rule at SPECIFICATION confidence, so a failure costs 4 × 1 points of impact in the HTML category before that category is normalised to 100.

What does SPECIFICATION confidence mean?

A standard says so: HTML, WCAG, an RFC or Google's own documentation. Confidence is a declared tier rather than a per-rule number, so every rule backed by the same class of evidence carries the same weight - which is what makes the score reproducible instead of hand-tuned.

How do I check HTML_NO_DEPRECATED_LANG_ATTR on my own site?

Paste your URL into the box above and it runs only this rule, usually in a couple of seconds. It is also included in the HTML checker and in a full scan.

HTMLMedium Affects your score

Language attributes are not empty

HTML_NO_DEPRECATED_LANG_ATTR

An empty lang attribute is invalid and worse than none: it overrides an inherited language with nothing, so screen readers fall back to the user's default voice mid-document.

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How this rule is weighted

Importance: 4 / 10; How much this matters relative to other rules.
Confidence: SPECIFICATION; A standard says so: HTML, WCAG, an RFC or Google's own documentation.
Severity: warning; How the finding is presented when it fails.
Scoring: Counts; A failure costs points in its category.

Impact is importance multiplied by the confidence tier’s weight — SPECIFICATION 1.0, RESEARCH 0.7, EMERGING 0.3, EXPERIMENTAL 0.1. Two rules backed by the same class of evidence therefore always carry the same weight, which is what makes the score reproducible rather than hand-tuned.

Questions about this rule

Does HTML_NO_DEPRECATED_LANG_ATTR affect my score?: Yes. It is an importance 4 rule at SPECIFICATION confidence, so a failure costs 4 × 1 points of impact in the HTML category before that category is normalised to 100.
What does SPECIFICATION confidence mean?: A standard says so: HTML, WCAG, an RFC or Google's own documentation. Confidence is a declared tier rather than a per-rule number, so every rule backed by the same class of evidence carries the same weight - which is what makes the score reproducible instead of hand-tuned.
How do I check HTML_NO_DEPRECATED_LANG_ATTR on my own site?: Paste your URL into the box above and it runs only this rule, usually in a couple of seconds. It is also included in the HTML checker and in a full scan.

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