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<html><body><iframe id="myframe" src="demo_iframe.html"></iframe><p>Click the button to change the background color of the document contained in the iframe.</p><p id="demo"></p><button onclick="myFunction()">Try it</button><script>function myFunction() { var x = document.getElementById("myframe"); var y = x.contentDocument; y.body.style.backgroundColor = "red";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_iframe_contentdocument2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:16:51 GMT --></html>