Roy Hinkis says, “The sitelinks search box (schema.org/SearchAction) is one of the most popular markups out there. According to SimilarTech, there are now more than 650,000 sites that have implemented this markup, making it one of the most popular of all schema markup types.

That said, we don’t really know the reason why Google sometimes shows the search box for branded queries for sites that have implemented the markup, and sometimes doesn’t. While we don’t know what Google’s criteria are behind the search box algorithm, we have the data to definitely see that there’s a correlation between the traffic of the websites and the appearance of the markup“.

Study: 300 Google Sitelinks Search Boxes – Triggers and Trip-Ups Analyzed

MOZ Blog

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