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<html><body><h1>The Document Object</h1><h2>The querySelector() Method</h2><p>Change the text of the element with id="demo":</p><p id="demo">This is a p element with id="demo".</p><script>document.querySelector("#demo").innerHTML = "Hello World!";</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_queryselector by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:43 GMT --></html>