Queries the Cloudflare and Google DNS-over-HTTPS endpoints straight from your browser and reports whether they respond, and how quickly. Useful for confirming that encrypted DNS is not being blocked by an ISP, a corporate proxy or a captive portal. Only these two are listed because they are the only major resolvers that return the CORS headers a web page needs to read a reply at all. Note what this does NOT do: it cannot tell you which resolver your operating system uses, so it is not a DNS leak test — see the note on the page for why that check cannot be done from a web page at all.
Runs entirely in your browser
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