Assertion:
Using a READONLY attribute in IE4 and IE5 on this element still
allows a user to invoke the file...open dialog (from the "Browse..." button), although
the text field is not directly editable. In IE5.5 plus, both the text field AND the
file...open dialog are not usable.
Plain Input Type=File field, no READONLY attribute:
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Input Type=File field, READONLY attribute present.
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