Viewport
Mobile browsers use the viewport declaration to decide how a layout fits the screen. A missing or fixed-width viewport can make responsive CSS behave like a desktop page.
Mobile SEO · viewport and source evidence
Check mobile SEO source signals
Run a live source check for the mobile viewport, language, UTF-8 clues, image alternatives, image dimensions, resource hints, render-blocking candidates, third-party resources, redirects, HTTPS, and crawler-access context. The report stays evidence-led and avoids a manufactured mobile score.
PAGE LIMIT2 MiBRESOURCES500 ROWSRENDERINGNOT EXECUTED
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Ready for a public HTML page.
No sample mobile score, device render, tap-target result, Core Web Vitals result, ranking claim, traffic claim, or manufactured mobile issue appears before a live bounded request.
Use source checks before lab and field checks
Fix declarations first, then verify rendered mobile behavior
Images
Alt attributes, responsive image declarations, width, and height help users, crawlers, and browsers understand media before the page is fully loaded.
Resources
Source-declared scripts, stylesheets, resource hints, and third-party URLs show what deserves browser-level testing for speed, layout stability, and user experience.