Missing viewport meta tag
Part of Documentation, UX & Accessibility, which counts for 15% of the overall score. When this check fires it deducts 8 points from that category, once per scan, no matter how many places it turns up.
What it detects
No <meta name="viewport"> tag found, so the page won't scale correctly on mobile.
Why it matters
Without a viewport meta tag, mobile browsers render the page at a desktop width (around 980px) and shrink it to fit, so users get tiny text, mis-sized tap targets, and pinch-zooming to read anything. Any responsive CSS you wrote never gets a chance to apply because the browser is not reporting the real device width. This is one of the highest-impact single lines in mobile web quality.
How to fix it
Add <meta name="viewport" content="width=device-width, initial-scale=1" /> inside the <head> of every HTML document, or once in the shared layout if pages extend a base template. Do not add user-scalable=no or maximum-scale=1; disabling pinch zoom is an accessibility problem. Then check the page at a 375px-wide viewport and fix anything that overflows horizontally.
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