HTML | DOM IFrame contentWindow Property

Last Updated : 16 Jun, 2022

The IFrame contentWindow Property in HTML DOM is used to return the Window object generated by an iframe element. It can be used in the host window to access the document object that belongs to a frame or iframe element.

Syntax:

iframeObject.contentWindow

Return Value: It returns reference Window object generated by an iframe element.

Example:

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        HTML DOM iframe contentWindow Property
    </title>
</head>
 
<body style="text-align:center;">
 
    <h1>GeeksforGeeks</h1>
 
    <h2> 
        HTML DOM iframe contentWindow Property 
    </h2>
 
    <iframe src="https://ide.geeksforgeeks.org/index.php"
            id="GFG"
            height="200" 
            width="400">
    </iframe>
 
    <br>
    <br>
 
    <button onclick="Geeks()">
        Submit
    </button>
 
    <script>
        function Geeks() {
            var iframeID = document.getElementById("GFG");
 
            var iframeCW = (iframeID.contentWindow || iframeID.contentDocument);
 
            if (iframeCW.document) iframeCW = iframeCW.document;
            iframeCW.body.style.border = "5px solid red";
        }
    </script>
</body>
 
</html>