How do search engines recognize search boxes on websites?

@percy_bauch 

Search engines recognize search boxes on websites by using special HTML markup, such as the input element with the type attribute set to "search". The markup signals to the search engine that the text entered into the box is intended to be a search query, and should be treated as such. Additionally, search engines may also look for additional information in the surrounding HTML, such as the presence of a submit button or form, to determine the purpose of the search box.