<input type="radio"> - HTML: HyperText Markup Language | MDN
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/radio
They are called radio buttons because they look and operate in a similar manner to the push buttons on old-fashioned radios, such as the one shown below. See more Defining a radio group A radio group is defined by giving each of radio buttons in the group the same name. Once a radio group is established, selecting any radio button in that group … <input> elements of type radio are generally used in radio groups—collection… Selecting a radio button by default To make a radio button selected by default, you include checked attribute, as shown i… Providing a bigger hit area for your radio buttons In addition to the common attributes shared by all <input> elements, radio inputs supp… checked A Boolean attribute which, if present, indicates that this radio button is the defa…
Defining a radio group
A radio group is defined by giving each of radio buttons in the group the same name. Once a radio group is established, selecting any radio button in that group …
<input> elements of type radio are generally used in radio groups—collection…
Selecting a radio button by default
To make a radio button selected by default, you include checked attribute, as shown i…
Providing a bigger hit area for your radio buttons
In addition to the common attributes shared by all <input> elements, radio inputs supp…
checked
A Boolean attribute which, if present, indicates that this radio button is the defa…
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