- For XHTML,
<input type="text" disabled="disabled" />
is the valid markup. - For HTML5,
<input type="text" disabled />
is valid and used by W3C on their samples. - In fact, both ways works on all major browsers.
<input type="text" disabled="disabled" />
is the valid markup.<input type="text" disabled />
is valid and used by W3C on their samples.