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<html><body><div id="myDIV"> <p id="demo">This is a p element with id="demo" in a div.</p></div><p>Click the button to change the text of the p element in div.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { var x = document.getElementById("myDIV"); x.querySelector("#demo").innerHTML = "Hello World!";}</script></body></html>