Does A11Y_HTML_LANG affect my score?

Yes. It is an importance 5 rule at SPECIFICATION confidence, so a failure costs 5 × 1 points of impact in the Accessibility 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 A11Y_HTML_LANG 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 Accessibility checker and in a full scan.

AccessibilityHigh Affects your score

<html> declares a lang attribute

A11Y_HTML_LANG

Screen readers and translation tools rely on lang to select the correct pronunciation/translation rules.

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How this rule is weighted

Importance: 5 / 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: error; 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 A11Y_HTML_LANG affect my score?: Yes. It is an importance 5 rule at SPECIFICATION confidence, so a failure costs 5 × 1 points of impact in the Accessibility 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 A11Y_HTML_LANG 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 Accessibility checker and in a full scan.

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