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file means "file" and is a selector in jquery. You can select input elements with the [type=file] attribute, and the syntax is [$(":file")].
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Definition and usage
: The file selector selects input elements with type=file.
Syntax
$(":file")
Example
Select the one with type="file"d5fd7aea971a85678ba271703566ebfd
Elements:
<script> $(document).ready(function(){ $(":file").css("background-color","red"); }); </script>
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