forms - What's the name of those input boxes which allow multiple autocompleted inputs which then become "buttons" in the textbox when selected? -

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a perfect example of im asking is, when asking question in so, @ "tags" input box. can type "php" , select multitude of "php" tags, when select it, "php" becomes button "x".

im curious technical term type of input can if jquery, extjs or various libraries im using have this.

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