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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <!--
 * Replace the iframes src attribute to test the same effect on other websites 
 *
 * ;)
 *
-->
<div class="main">
	<iframe height="3000" frameborder="0" scrolling="no" src="//www.ubuntu.com"></iframe>
	</div>
	<div class="blurred">
		<iframe height="3000" frameborder="0" scrolling="no" src="//www.ubuntu.com"></iframe>
		<p>Vague.js</p>
</div>
!

CSS

            
              @import "compass/css3";

	@import url(https://fonts.googleapis.com/css?family=Satisfy);
	iframe{
		position:absolute;
		top:0;
		left:0;
		overflow:hidden;
		width:100%;
      /* fix for the stupid safari */
      -webkit-transform: translate3d(0,0,0);
	}
	iframe.main {
		position:absolute;
		height:100%;
		width:100%;
	}
	.blurred {
		box-shadow: 0 5px 50px rgba(0,0,0,0.4);
		overflow:hidden;
		position:fixed;
		bottom:-10px;
		left:0;
		height:200px;
		width:100%;
	}
	.blurred p {
		font-family: 'Satisfy', cursive;
		position:absolute;
		top:50px;
		width:100%;
		color:white;
		text-align: center;
		text-shadow:1px 1px 2px black;
		font-size:70px;
	}
!

JS

            
              /**
*
* Author: Gianluca Guarini
* Contact: gianluca.guarini@gmail.com
* Website: http://www.gianlucaguarini.com/
* Twitter: @gianlucaguarini
* https://gianlucaguarini.github.io/vague.js/
*
* Copyright (c) 2013 Gianluca Guarini
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
**/

var $window = $(window),
    $main = $('.mainIframe');
    $blurred = $('.blurred');
var vague = $blurred.find('iframe').Vague({
  intensity:5 //blur intensity
});
vague.blur();

var scrollIframe = function () {
  $blurred.find('iframe').css({
    top: -$blurred.offset().top
  });
};
$window.on('scroll',scrollIframe);

scrollIframe();
!
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