cers/zscroll.html

## zscroll.html
<html>
<head>
  <title>Scrolling along the Z-Axis</title>
  <!--
  Example from http://eng.wealtfront.com
  Assumes browser window is sized at a height of 400px (the size of the black box).
  -->
  <style>
  body{height:600px;}
  #viewport {
   position:fixed;
   -moz-perspective:100px;
   -moz-perspective-origin:50% 50%;
   border: 2px solid black;
   height: 400px;
   width: 400px;
   left:50%;
   margin-left:-200px;
  }
.box {
   position:absolute;
   width:100px;
   height:100px;
   left:50%;
   top:50%;
   margin-left:-50px;
   margin-top:-50px;
 }
 #a {
   background-color:rgba(255,0,0,.5);
   border:2px solid red;
   -moz-transform:translateZ(-100px)

 }
 #b {
   background-color:rgba(0,255,0,.5);
   border:2px solid green;
   -moz-transform:translateZ(-50px)
 }
 #c {
  background-color:rgba(0,0,255,.5);
  border:2px solid blue;
  -moz-transform:translateZ(0px)
 }

  </style>
</head>
<body>
  <div id="viewport">
    <div class="box" id="a"></div>
    <div class="box" id="b"></div>
    <div class="box" id="c"></div>
  </div>
  <script>
    var scrollPosition = document.body.scrollTop,
        boxPositions = [-100, -50, 0];
    function scrollDelta() {
      var newScrollPosition = document.body.scrollTop,
          delta = newScrollPosition - scrollPosition;
      scrollPosition = document.body.scrollTop;
      return delta;
    }
    function moveCamera() {
      var boxes = document.getElementsByClassName("box"),
          delta = scrollDelta();
      for (var i=0,l=boxes.length;i<l;i++) {
        boxPositions[i] += parseInt(delta);
        boxes[i].style.MozTransform = "translateZ("+boxPositions[i]+"px)";
      }
    }
    window.addEventListener("scroll", moveCamera, false);
 </script>
</body>
</html>
	<html>
	<head>
	<title>Scrolling along the Z-Axis</title>
	<!--
	Example from http://eng.wealtfront.com
	Assumes browser window is sized at a height of 400px (the size of the black box).
	-->
	<style>
	body{height:600px;}
	#viewport {
	position:fixed;
	-moz-perspective:100px;
	-moz-perspective-origin:50% 50%;
	border: 2px solid black;
	height: 400px;
	width: 400px;
	left:50%;
	margin-left:-200px;
	}
	.box {
	position:absolute;
	width:100px;
	height:100px;
	left:50%;
	top:50%;
	margin-left:-50px;
	margin-top:-50px;
	}
	#a {
	background-color:rgba(255,0,0,.5);
	border:2px solid red;
	-moz-transform:translateZ(-100px)

	}
	#b {
	background-color:rgba(0,255,0,.5);
	border:2px solid green;
	-moz-transform:translateZ(-50px)
	}
	#c {
	background-color:rgba(0,0,255,.5);
	border:2px solid blue;
	-moz-transform:translateZ(0px)
	}

	</style>
	</head>
	<body>
	<div id="viewport">
	<div class="box" id="a"></div>
	<div class="box" id="b"></div>
	<div class="box" id="c"></div>
	</div>
	<script>
	var scrollPosition = document.body.scrollTop,
	boxPositions = [-100, -50, 0];
	function scrollDelta() {
	var newScrollPosition = document.body.scrollTop,
	delta = newScrollPosition - scrollPosition;
	scrollPosition = document.body.scrollTop;
	return delta;
	}
	function moveCamera() {
	var boxes = document.getElementsByClassName("box"),
	delta = scrollDelta();
	for (var i=0,l=boxes.length;i<l;i++) {
	boxPositions[i] += parseInt(delta);
	boxes[i].style.MozTransform = "translateZ("+boxPositions[i]+"px)";
	}
	}
	window.addEventListener("scroll", moveCamera, false);
	</script>
	</body>
	</html>