The Radio object represents a radio button in an HTML form.
Radio buttons allow the user to select only ONE of a predefined set of options. You define groups
with the name property (radio buttons with the same name belong to the same group).
For each <input type="radio"> tag in an HTML form, a Radio object is created.
You can access a radio object by searching through the elements array of the form, or by using
W3C: W3C Standard.
The Radio object also supports the standard properties, methods, and
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