A disabled <keygen> element:
The disabled attribute is a boolean attribute.
When present, it specifies that a <keygen> element should be disabled. A disabled field is unusable and un-editable.
The numbers in the table specify the first browser version that fully supports the attribute.
The <keygen> tag is new in HTML5.
In XHTML, attribute minimization is forbidden, and the disabled attribute must be defined as <keygen disabled="disabled" />.