The checked attribute in HTML is used to indicate whether an element should be checked when the page loads up. It is a Boolean attribute.
Supported Tags: <input>
Syntax
<input type = "checkbox|radio" checked>Example 1: In this example, the checked attribute sets the first checkbox as checked by default, while the second checkbox remains unchecked, allowing users to toggle selections.
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<!DOCTYPE html>
<html>
<head>
<title>HTML checked Attribute</title>
</head>
<body style="text-align: center;">
<h1 style="color: green;">GeeksforGeeks</h1>
<h2>HTML checked Attribute</h2>
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<form>
<!-- Below input elements have attribute "checked" -->
<input type="checkbox"
name="check"
value="1"
checked>
Checked by default<br>
<input type="checkbox"
name="check"
value="2">
Not checked by default<br>
</form>
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</body>
</html>
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Example 2: In this example we are using the checked attribute, automatically selecting the first radio button by default. The second radio button is not selected by default, offering an alternative choice.
<!--Driver Code Starts-->
<!DOCTYPE html>
<html>
<head>
<title>HTML checked Attribute</title>
</head>
<body style="text-align: center;">
<h1 style="color: green;">GeeksforGeeks</h1>
<h2>HTML checked Attribute</h2>
<!--Driver Code Ends-->
<form>
<!-- Below input elements have attribute "checked" -->
<input type="radio"
name="check"
value="1" checked>
Selected by default<br>
<input type="radio"
name="check"
value="2">
Not selected by default<br>
</form>
<!--Driver Code Starts-->
</body>
</html>
<!--Driver Code Ends-->
