HTML DOM isDefaultNamespace() Method

The DOM isDefaultNamespace() method is used to return boolean true if the specified namespace is default otherwise, it returns boolean false. The URI of the namespace required can be checked using the namespaceURI string.

Syntax:

node.isDefaultNamespace

Return Value: It returns a boolean value true if the namespace is default, otherwise it returns false.

Now let's understand this with the help of example:

index.html

<!DOCTYPE html>
<html>

<head>
    <title>
        HTML | DOM isDefaultNamespace() Method
    </title>
</head>

<body>
    <h1>
      <center>
        Geeks 
        <button onclick="space()">
          Press
        </button>
      </center> 
    </h1>
    <h4>
      Clicking on the 'Press' button will display
      if the specified namespace is default.
    </h4>
    <p id="demo"></p>
    <script>
        function space() {
            // Access and return default namespace property.
            var d =
                document.documentElement;
            var x =
                d.isDefaultNamespace(
                    "https://www.geeksforgeeks.org/community/");
            document.getElementById("demo").innerHTML =
                x;
        }
    </script>

</body>

</html>

Output:

Before clicking on the button:

After clicking on the button:

Browser Support: The browsers supported by DOM isDefaultNamespace() method are listed below:

Google Chrome 1 and above
Edge 12 and above
Internet Explorer 9.0 and above
Firefox 1 and above
Opera 12.1 and above
Safari 3 and above

Note: Internet Explorer8 and earlier versions don't support this method.