Javascript DOM HTML Element getElementsByTagName() Method get all elements inside a <div>

Introduction

Change the background color of the fourth element (index 3) inside a <div> element:

Click the button to add a background color to the fourth element inside the div element.

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<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {//from  w w  w .  j av a 2 s.  co m
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<div id="myDIV">
  <h3>A h3 element in div.</h3>
  <p>P element in div.</p>
  <span>A span element in div.</span>
  <h2>A h2 element in div.</h2>
  <div>A div element in div.</div>
  <p>Another p element in div.</p>
</div>
<button onclick="myFunction()">Test</button>
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  x.getElementsByTagName("*")[3].style.backgroundColor = "red";
}
</script>
</body>
</html>



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