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<meta name="assert" content="Test checks that rotate a 2:1 rectangle on Y-axis for 60 degree we will get a square and completely cover the red square, and here we use border due to the rectangle not be rotated would cover the red square.">
<style>
div {
position: absolute;
}
div.redsquare {
background-color: red;
border: 20px solid black;
height: 120px;
left: 60px;
top: 60px;
width: 120px;
}
div.green {
background-color: green;
height: 120px;
left: 20px;
top: 80px;
transform: rotate3d(0,1,0,-60deg);
width: 240px;
}
</style>
</head>
<body>
<p>Test passes if there is a green square with black border around, and no any red.</p>