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How do websites get the “Add Search Engine” button? For instance, I noticed I can do it with Gandi but not with Name or Namecheap.

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They publish a small “OpenSearch description file” XML document somewhere on the domain, then put the path to that file in an HTML meta tag (which enables browser auto-discovery). Here’s more: https://developer.mozilla.org/en-US/docs/Web/OpenSearch

Very interesting, thanks :)

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