metadata · metadata.viewport.missing
No viewport meta tag
Without a viewport tag, mobile browsers render the page at desktop width and scale it down — unreadable, and penalised under mobile-first indexing.
Why it matters
Google has used mobile-first indexing since 2019. A missing viewport causes desktop-width rendering on mobile, hurting Core Web Vitals and rankings.
Example fix
<meta name="viewport" content="width=device-width, initial-scale=1" />
Authoritative reference
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