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<html><body><h1 id="demo">This is a Heading</h1><button type="button"onclick="document.getElementById('demo').innerHTML = 'Hello World!'">Click Me!</button></body><!-- Mirrored from www.w3schools.com/xml/tryit.asp?filename=tryxml_change_html by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:04:08 GMT --></html>