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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<body>
<p>This is a p element.</p>
<p>This is also a p element.</p>
<p>Click the button to add a background color to the first p element in the document.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.querySelector("p").style.backgroundColor = "red";
}
</script>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_queryselector_p by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:02:16 GMT -->
</html>
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