Button: Buttonset radio buttons ignore readonly attribute

[felixg]

When creating a buttonset of <input type="radio" .../> the readonly attribute is ignored, and the user can change the button's state.

[Jörn Zaefferer]

Do we want to support this? Is there a difference between readonly and disabled for radio buttons?

[bchiasson]

The browsers do not prevent users from changing to a non-readonly option in the group if a single item is marked readonly or disabled. Logically, the entire group should be disabled if you want to prevent a user from changing the state.

[myleslee]

if an input is disabled, its value won't be included when the form is submitted. While it's readonly, the value will be submitted. It affects the back-end processing.

[Scott González]

So to clarify: the request is to treat readonly the same as disabled in terms of user perception and interaction?