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x
 
<!DOCTYPE html>
<html>
<head>
<style>
div {
  width: 100px;
  height: 100px;
  background-color: lightgreen;
  border: 2px solid black;
  padding: 10px;
}
#myDiv1 {
  transform: rotateX(40deg);
}
#myDiv2 {
  transform: rotateX(60deg);
}
#myDiv3 {
  transform: rotateX(80deg);
}
</style>
</head>
<body>
<h1>The rotateX() function</h1>
<div>
This a normal div element.
</div>
<div id="myDiv1">
Div1.
</div>
<div id="myDiv2">
Div2.
</div>
<div id="myDiv3">
Div3.
</div>
</body>
</html>