What is an HTML radio button? In HTML, a radio button is an interactive page element for selecting one option from multiple options. A radio button appears as an empty circle when unselected.

How do radio buttons work in HTML?

In HTML, a radio button is used to select one of many given choices. Radio buttons are shown in radio groups to show a set of related options, only one of which can be selected. A radio button in HTML can be defined using the <input> tag.

How do I get radio button checked in HTML?

You can check a radio button by default by adding the checked HTML attribute to the <input> element. You can disable a radio button by adding the disabled HTML attribute to both the <label> and the <input> .