Referrer policy checker

Precedence here follows the standards rather than the common folklore: the browser processes the meta element before the Referrer-Policy header, so a valid meta tag wins, an invalid one is skipped, and inside a channel the last understood value applies. That last rule is why comma lists like "unsafe-url, no-referrer" exist, older browsers take the first value they know and newer ones take the last. What this checker does not do is fetch anything or judge whether your choice suits your site; the trade-off notes under each value are the whole of that advice.