What it checks
- Mobile viewport rendering
- Horizontal overflow detection
- Likely offending elements
- Element width and right-edge evidence
- Mobile JavaScript errors
- Mobile failed requests
- Captured screenshot evidence
Mobile Layout Checker for Horizontal Overflow
Detect pages that are wider than the mobile viewport and identify likely elements causing horizontal overflow.
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A page can be technically responsive and still be unusable
One oversized slider, banner or fixed-width container can force a mobile page wider than the viewport. The browser check measures the rendered page and surfaces likely root-cause elements instead of only saying 'mobile overflow: yes'.