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HTML | DOM isId Property

  • Last Updated : 11 Aug, 2021

The isId Property contains a boolean value which returns a true if the Element has an attribute type of ID, otherwise, it returns a false or undefined value. This Property is used for read-only. 
Syntax: 
 

attribute.isId 

Return Value: It returns a Boolean value i.e true if the attribute type is ID, else it returns a false . 
Example: 
 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>DOM isID property</title>
</head>
 
<body>
    <center>
        <h1 style="color:green;">GeeksforGeeks</h1>
        <h2> DOM isId Property</h2>
 
        <button onclick="geeks()">Submit</button>
        <p id="sudo"></p>
 
        <script>
            function geeks() {
                var x = document.getElementById("sudo");
                x.innerHTML = x.attributes[0].isId;
            }
        </script>
    </center>
</body>
 
</html>

Output: 
Before clicking the submit button: 
 

After clicking the submit button: 
 

Supported Browser: No major browser support the DOM isID property.
 

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