Javascript DOM HTML Document querySelector() Method by parent tag and child tag

Introduction

Get the first <p> element in the document where the parent is a <div> element. 

document.querySelector("div > p");

Click the button to change the background color of the first p element in the document where the parent is a div element.

View in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
div {// w w  w.  j  a va2  s  . c o  m
  border: 1px solid black;
  margin-bottom: 10px;
}
</style>
</head>
<body>

<div>
  <h3>H3 element</h3>
  <p>I am a p element, my parent is a div element.</p>
</div>

<div>
  <h3>H3 element</h3>
  <p>I am a p element, my parent is also a div element.</p>
</div>


<button onclick="myFunction()">Test</button>

<script>
function myFunction() {
  var x = document.querySelector("div > p");
  x.style.backgroundColor = "red";
}
</script>

</body>
</html>



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