The Checkbox CSS Hack (doesn't work in IE <= 8, but all other browsers fine)

1. elements.html

<label for="toggle-1">I'm a toggle</label>
<input type="checkbox" id="toggle-1">
<div>I'm controlled by toggle. No JavaScript!</div>

2. styles.css

/* Checkbox Hack */

input[type=checkbox] {
   position: absolute;
   top: -9999px;
   left: -9999px;
}
label { 
  -webkit-appearance: push-button;
  -moz-appearance: button; 
  display: inline-block;
  margin: 60px 0 10px 0;
  cursor: pointer;
}

/* Default State */
div {
   background: green;
   width: 400px;
   height: 100px;
   line-height: 100px;
   color: white;
   text-align: center;
}

/* Toggled State */
input[type=checkbox]:checked ~ div {
   background: red;
}

Hey Mark, I've created a Javascript polyfill which adds support for IE <= 8.
Check it out: https://github.com/jamesl1001/checkbox-hack-polyfill