A file upload field that accepts multiple values:
The multiple attribute is supported in Internet Explorer 10, Firefox, Opera, Chrome, and Safari.
Note: The multiple attribute of the <input> tag is not supported in Internet Explorer 9 and earlier versions.
The multiple attribute is a boolean attribute.
When present, it specifies that the user is allowed to enter more than one value in the <input> element.
Note: The multiple attribute works with the following input types: email, and file.
The multiple attribute is new in HTML5.
In XHTML, attribute minimization is forbidden, and the multiple attribute must be defined as <input multiple="multiple" />.
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