HTML | DOM isId Property

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:

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<!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>

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Output:
Befor clikinig the submit button:

After clicking the submit button:

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



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