Multi-viewport responsive review
Visual Proof
Inspect one markup sample at three named widths. This is a preview tool; for certified screenshot comparisons use the included browser automation scripts.
Viewport matrix
Document preview · local browserMobile · 375 px
Tablet · 768 px
Desktop · 1280 px
These are scaled local previews, not pixel-accurate device screenshots, browser coverage, accessibility certification or screenshot diffing. Actual rendering must still be tested using real viewport-sized browsers.
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