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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<style>
div {
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>
​
<div id="myDIV">
  <p>First p element in div.</p>
  <p>Second p element in div.</p>
  <p>Third p element in div.</p>
</div>
​
<p>Click the button to add a background color to all p elements inside the div element.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  var y = x.getElementsByTagName("P");
  var i;
  for (i = 0; i < y.length; i++) {
    y[i].style.backgroundColor = "red";
  }
}
</script>
​
</body>
​
</html>
​
​
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