HTML | DOM contains() Method

The contains() method is used to find whether the specified node is a descendant of the given node.
This descendant can be a child, grandchild, great-grandchild, and so on.

Syntax:

node.contains( otherNode )

Parameters: The “othernode” in the syntax is the parameter required in this function.

Return Value: It returns true if node is descendant of the given node else false.

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>HTML | DOM contains() Method</title> 
    <!--script to check, if a node contains descendant-->
    <script> 
        function containchild() { 
            var span =  
            document.getElementById("sp1"); 
            var div =  
            document.getElementById("para1").contains(span); 
            document.getElementById("result").innerHTML = div; 
        } 
    </script> 
</head> 
  
<body> 
    <center> 
        <h1 style="color:green"> 
            Welcome to GeeksforGeeks</h1></center> 
    <div id="para1"> 
        <p>Social media is not about the  
        <span id="sp1">exploitation of technology</span>  
        but service to community.</p> 
    </div> 
  
    <p>Click the button to find out if the div 
    element contains a span element.</p> 
  
    <button onclick="containchild()">Check</button> 
  
    <!--for displaying boolean value -->
    <p id="result"></p> 
</body> 
  
</html>                     

Output:
Before clicking on the check button:

After clicking on the check button:

Supported Browsers: The browser supported by DOM contain() Method are listed below:

Google Chrome
Internet Explorer
Firefox
Opera
Safari

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