Javascript DOM CSS Style width Property set for <div>

Introduction

Change the width of a <div> element: 

document.getElementById("myDIV").style.width = "500px";

Click the button to change the width of the DIV element:

View in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {//  w  w w  .  ja v  a  2  s .c  om
  width: 100px;
  height: 100px;
  background-color: coral;
  color: white;
}
</style>
</head>
<body>
<button onclick="myFunction()">Test</button>

<div id="myDIV">
  <h1>myDIV</h1>
</div>

<script>
function myFunction() {
  document.getElementById("myDIV").style.width = "500px";
}
</script>

</body>
</html>



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