Prevents Google from showing a Site Links search box.
https://support.google.com/webmasters/answer/79812
Widgets · Site Search
Get access to data on 422,127 websites Google No Site Links Search Customers. We know of 240,803 live websites using Google No Site Links Search and an additional 181,324 sites that used Google No Site Links Search historically and 109,225 websites in the United States.
Get a list of 422,127 websites using Google No Site Links Search which includes location information, hosting data, contact details, 240,803 currently live websites and an additional 173,481 domains that redirect to sites in this list. 181,324 sites that used this technology previouslyand 109,225 websites in the United States currently using Google No Site Links Search.
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