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<html>
<head>
<style>
.external{
perspective:300px;
perspective:300px; /* for safari */
width:150px;
height:150px;
background-color:rgb(210,210,210);
}
.internal1{
transform:rotateY(0deg);
transform:rotateY(0deg); /* for safari */
width:150px;
height:150px;
background-color:lightblue; color:white;
}
.internal2{
transform:rotateY(45deg);
transform:rotateY(45deg); /* for safari */
width:150px;
height:150px;
background-color:lightblue; color:white;
}
</style>
</head>
<body>
<div class="external">
<div class="internal1">
</div>
</div>
<p>transform:rotateY(0deg);</p>
<div class="external">
<div class="internal2">
</div>
</div>
<p>transform:rotateY(45deg);</p>
</body>
</html>