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<!DOCTYPE html>
<html>
<head>
<style>
#DIV1 {
  position: relative;
  height: 200px;
  width: 200px;
  margin: 100px;
  padding: 10px;
  border: 1px solid black;
}
#DIV2 {
  padding: 50px;
  position: absolute;
  border: 1px solid black;
  background-color: coral;
  transform: rotateY(50deg);
}
#DIV3 {
  padding: 40px;
  position: absolute;
  border: 1px solid black;
  background-color: lightblue;
  transform: rotateY(70deg);
}
</style>
</head>
<body>
<h1>Change transform-style with JavaScript</h1>
<p>Click the "Try it" button to preserve the 3D position of the child elements of the DIV2 element:</p>
<button onclick="myFunction()">Try it</button>
<div id="DIV1">DIV1
  <div id="DIV2">HELLO DIV2
  <div id="DIV3">HELLO DIV3</div>