<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Block Nav - CodePen</title>
<style>
* {font-size: 100%;}
html{background: #d4d4d4;}
a {
color: #2b2b2b;
text-decoration: none;
}
.blocks {
width: 470px;
margin: 0 auto;
}
.block {
position: relative;
float: left;
height: 50px;
width: 33.333333%;
font-size: 2em;
text-transform: uppercase;
}
.block .block--norm {
-webkit-transform: rotateX(-90deg);
-moz-transform: rotateX(-90deg);
-ms-transform: rotateX(-90deg);
-o-transform: rotateX(-90deg);
transform: rotateX(-90deg);
background: #1a1a1a;
color: #fefefe;
}
.block .block--hover {
-webkit-transform: rotateX(0deg);
-moz-transform: rotateX(0deg);
-ms-transform: rotateX(0deg);
-o-transform: rotateX(0deg);
transform: rotateX(0deg);
background: #ff0044;
}
.block:hover .block--norm {
-webkit-transform: rotateX(0deg);
-moz-transform: rotateX(0deg);
-ms-transform: rotateX(0deg);
-o-transform: rotateX(0deg);
transform: rotateX(0deg);
}
.block:hover .block--hover {
-webkit-transform: rotateX(90deg);
-moz-transform: rotateX(90deg);
-ms-transform: rotateX(90deg);
-o-transform: rotateX(90deg);
transform: rotateX(90deg);
}
.block div {
position: absolute;
top: 0;
padding: 30px;
box-shadow: 0px 0px 40px rgba(47, 47, 47, 0.6) inset;
-webkit-backface-visibility: hidden;
-webkit-font-smoothing: antialiased;
-webkit-transition: 400ms;
-moz-transition: 400ms;
-o-transition: 400ms;
transition: 400ms;
-webkit-transform-origin: 50% 50% -75px 50%;
-moz-transform-origin: 50% 50% -75px 50%;
-ms-transform-origin: 50% 50% -75px 50%;
-o-transform-origin: 50% 50% -75px 50%;
transform-origin: 50% 50% -75px 50%;
}</style>
<script>
window.confirm = function(){};
window.prompt = function(){};
window.open = function(){};
window.print = function(){};
// Support hover state for mobile.
if (false) {
window.ontouchstart = function(){};
}
</script>
</head>
<body>
<div class="blocks">
<a href="#">
<div class="block">
<div class="block--norm">
<h2>Home</h2>
</div>
<div class="block--hover">
<h2>Home</h2>
</div>
</div>
</a>
<a href="#">
<div class="block">
<div class="block--norm">
<h2>Work</h2>
</div>
<div class="block--hover">
<h2>Work</h2>
</div>
</div>
</a>
<a href="#">
<div class="block">
<div class="block--norm">
<h2>About</h2>
</div>
<div class="block--hover">
<h2>About</h2>
</div>
</div>
</a>
</div>
<script>
if (document.location.search.match(/type=embed/gi)) {
window.parent.postMessage('resize', "*");
}
</script>
</body>
</html>
其中-webkit-transform-origin: 50% 50% -75px 50%; 四个参数，什么意思，请大牛回答
