Every radio button group should have at least 2 radio buttons.Responsive web design

What does it mean by every radio button should have atleast 2 radio buttons.

Hey there! Welcome to the forums!

A group of radio buttons are all the <input type="radio"> elements on a page with the same name attribute. So for example:

<input type="radio" name="group1">
<input type="radio" name="group1">
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