Does HTML_META_VIEWPORT_PRESENT affect my score?

Yes. It is an importance 7 rule at RESEARCH confidence, so a failure costs 7 × 0.7 points of impact in the HTML category before that category is normalised to 100.

What does RESEARCH confidence mean?

Backed by large-sample study or industry research, not a specification. 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_META_VIEWPORT_PRESENT 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.

HTMLHigh Affects your score

Document declares a viewport

HTML_META_VIEWPORT_PRESENT

Without a viewport meta tag mobile browsers render at a 980px virtual width and scale down, so the page arrives zoomed out and unreadable regardless of how good the responsive CSS is.

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How this rule is weighted

Importance: 7 / 10; How much this matters relative to other rules.
Confidence: RESEARCH; Backed by large-sample study or industry research, not a specification.
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 HTML_META_VIEWPORT_PRESENT affect my score?: Yes. It is an importance 7 rule at RESEARCH confidence, so a failure costs 7 × 0.7 points of impact in the HTML category before that category is normalised to 100.
What does RESEARCH confidence mean?: Backed by large-sample study or industry research, not a specification. 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_META_VIEWPORT_PRESENT 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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