html - What is the correct value for the disabled attribute?

Question

What is the correct value for the disabled attribute for a textbox or textarea?

I've seen the following used before:

<input type="text" disabled />
<input type="text" disabled="disabled" />
<input type="text" disabled="true" />

Answer 1

• 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.