Why is perspective not working?

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I'm trying to make a very basic 3D square.

 div {
 width: 300px;
 height: 300px;
 background: #333;
 transform: rotateX(50deg);
 -webkit-transform: rotateX(50deg);
 -moz-transform: rotateX(50deg);
 -ms-transform: rotateX(50deg);
 Perspective: 300px;
 -webkit-Perspective: 300px;
 -moz-Perspective: 300px;
 -ms-Perspective: 300px;
 }

Testing on chrome, RotateX works (as in the box height shrinks) but there's no perspective. Perspective property isn't working. I don't get it, What am I doing wrong?

2 Answers
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