VPViewportProofFree betaInstall free

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Tell us what would make the report more useful.

ViewportProof is a free beta. Clear bug reports and report-quality feedback directly shape the next release.

Before sending a bug

  1. Confirm the page is an ordinary HTTP or HTTPS website.
  2. Keep the temporary capture popup and Capture Center open until restoration finishes.
  3. Include the error code shown in the Capture Center, but do not include private URLs or client content.

Known boundaries

ViewportProof validates responsive CSS widths in desktop Chrome. It does not emulate Safari, physical phones, touch input, mobile user agents, or independently scrolling application panels.

Do not paste private client content. This form sends only what you type and the category you choose.