An HTML form with a read-only input field:
The readonly attribute is supported in all major browsers.
The readonly attribute is a boolean attribute.
When present, it specifies that an input field is read-only.
A read-only input field cannot be modified (however, a user can tab to it, highlight it, and copy the text from it).
In XHTML, attribute minimization is forbidden, and the readonly attribute must be defined as <input readonly="readonly" />.
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