Check the viewport tag and spot fixed widths that break on phones.
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Google indexes the mobile version of your site, so the mobile version is the one being judged. This checks the markup-level signals that decide whether a page can adapt to a small screen at all.
It tells the browser to render the page at the device width rather than a simulated desktop width. Without it, a phone shows a zoomed-out desktop layout.
Yes, and more fundamentally Google uses mobile-first indexing, meaning the mobile version is what gets indexed and ranked.
width=device-width, initial-scale=1 covers almost every case. Avoid maximum-scale or user-scalable=no, which prevent zooming and are an accessibility failure.
No. This checks markup signals only. It cannot render the page or measure tap-target spacing.
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