HTMLInputElement: defaultChecked property
The defaultChecked property of the HTMLInputElement interface specifies the default checkedness state of the element. This property reflects the <input> element's checked attribute.
The boolean checked attribute is valid for the radio (<input type="radio">) and checkbox (<input type="checkbox">) input types. The presence of the attribute sets the defaultChecked property to true.
Value
A boolean.
Examples
js
const inputElement = document.getElementById("contactMail");
console.log(inputElement.defaultChecked);