Radio buttons allow the selection of a single option from a set
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Radio buttons allow the user to select one option from a set. Use radio buttons for exclusive selection if you think that the user needs to see all available options side-by-side.
Radio Buttons are used when there is a list of two or more options that are mutually exclusive and the user must select exactly one choice. In other words, clicking a non-selected radio button will deselect whatever other button was previously selected in the list.
Always use a clear and concise label for radio buttons. Be explicit about the action that will follow if the radio button is selected. Labels appear to the right of radio buttons. Use sentence-style capitalization (only the first word in a phrase and any proper nouns capitalized) and no more than three words.
A set of radio buttons should default to having one option selected. Never display them without a default selection.