Chrome Smart Site Search

I noticed that several sites have Chrome search functionality built in. If I type stackoverflow.com and then hit a space in the address bar, I get:Chrome site search




Which takes me to this: SO search

How it's done, major sites like Stackoverflow and github have this feature, but sites that don't apply this standard to regular google searches

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This line, which is found in the HTML of every page, answers:

<link rel="search" type="application/opensearchdescription+xml" title="Stack Overflow" href="/opensearch.xml">

      



The format of this XML file is documented here:

http://www.opensearch.org/Specifications/OpenSearch/1.1

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