Fixing OptionsetField template

[3Dgoo]

Fixing OptionsetField template so that required works like the default template

[michalkleiner]

Is this still relevant @3Dgoo? If so, can you please rebase?

[3Dgoo]

I have rebased this as requested. Yes, this is still relevant. Let me know if there is anything else you need from me.

[michalkleiner]

Does it add the attribute to all the options then, is that valid?

[3Dgoo]

Yes it does add the attribute to all the options. I believe this is valid and correct, yes.

[3Dgoo]

https://html.spec.whatwg.org/multipage/input.html#the-required-attribute

For radio buttons, the required attribute is satisfied if any of the radio buttons in the group is selected.
To avoid confusion as to whether a radio button group is required or not, authors are encouraged to specify the attribute on all the radio buttons in a group. Indeed, in general, authors are encouraged to avoid having radio button groups that do not have any initially checked controls in the first place, as this is a state that the user cannot return to, and is therefore generally considered a poor user interface.