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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <div id="box">Press to toggle</div>
<div id="box2">Press to toggle</div>

<!-- box uses a second, blurred image that matches the initial image and transitions opacity -->

<!-- box2 blurs the image directly, attempting to transition -->
            
          
!
            
              
div {
	  border: 1px solid #000;
  text-align: center;
    
	  position: relative;
	  height: 200px;
  width: 200px;
  margin: 0 auto;
	  background: rgb(245, 248, 250) url(https://danielcwilson.com/demos/ios7blur/back.png) top center no-repeat;
	  -webkit-background-size: 200px 1025px;
	  -moz-background-size: 200px 1025px;
	  background-size: 200px 1025px;
  margin: 0 10px 10px;
  display: inline-block;
}

#box::after {
		  content: "";
		  opacity: 0;
		  top: 0;
		  left: 0;
		  bottom: 0;
		  right: 0;
		  position: absolute;
		  z-index: 0;   

		  -webkit-transition: opacity .35s ease-in-out;
		  -moz-transition: opacity .35s ease-in-out;
		  transition: opacity .35s ease-in-out;

		  background: rgb(245, 248, 250) url(https://danielcwilson.com/demos/ios7blur/backBlurred.jpg) top center no-repeat;
		  -webkit-background-size: 295px 1025px;
		  -moz-background-size: 295px 1025px;
		  background-size: 295px 1025px;
}
#box.selected::after {
  opacity: 1;
}

#box2 {
		  -webkit-transition: -webkit-filter .35s ease-in-out;
		  transition: -webkit-filter .35s ease-in-out;
		  transition: filter .35s ease-in-out;
}
#box2.selected {
  -webkit-filter: blur(15px);
  filter: blur(15px);
}


            
          
!
            
              function toggler(e) {
  e.currentTarget.classList.toggle('selected');
}
document.getElementById('box').addEventListener('click', toggler, false);
document.getElementById('box2').addEventListener('click', toggler, false);
            
          
!
999px
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