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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 350px;
  height: 100px;
  border: 1px solid #c3c3c3;
  display: flex;
}
​
#main div:nth-of-type(1) {flex-grow: 1;}
#main div:nth-of-type(2) {flex-grow: 1;}
#main div:nth-of-type(3) {flex-grow: 1;}
</style>
</head>
<body>
​
<h1>Change flex-grow with JavaScript</h1>
​
<div id="main">
  <div style="background-color:coral;"></div>
  <div style="background-color:lightblue;" id="myBlueDiv"></div>
  <div style="background-color:khaki;"></div>
</div>
​
<p>Click the "Try it" button to set the value of the flexGrow property to "5" for the blue div element</p>
​
<button onclick="myFunction()">Try it</button>
​
<p><b>Note:</b> Internet Explorer 10 and earlier versions earlier versions do not support the flexGrow property.</p>
​
<script>
function myFunction() {
  document.getElementById("myBlueDiv").style.flexGrow = "5";
}
</script>
​
</body>
​
</html>
​
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