Javascript DOM HTML Element id Property check

Introduction

If the first <div> element in the document has an id of "myDIV", change its font-size:

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<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {//from ww w  .j  a  v  a  2 s.  co m
  width: 300px;
  height: 50px;
  text-align: center;
  background-color: coral;
  color: white;
  margin-bottom: 10px;
}
</style>
</head>
<body>
<div id="myDIV" class="mystyle">
I am a DIV element
</div>

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

<script>
function myFunction() {
  var x = document.getElementsByTagName("DIV")[0];

  if (x.id === "myDIV") {
    x.style.fontSize = "30px";
  }
}
</script>

</body>
</html>



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