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I just tried the following HTML :
<input type='radio' checked='checked' name='test' id='r1' />
<input type='radio' checked='' name='test' id='r2' />
which (in my mind’s eye) should have the first radio button checked. Turns out browsers will check any radio button with a checked attribute.
Is there a ‘false’ value, that won’t check the button, so my code is consistent?
The absence of the checked attribute is the only way you can do this.
Traditionally only the word checked was requried to indicate a checked status (you didn’t have to set it to be a value). I think the attributename=”value” pattern is for compatibility with standards such as xhtml (which is why browsers ignore the value itself)