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              	<div id="radios">
		<input id="png" value="png" type="radio" name="filetype" checked="checked" class="filetype" /><label for="png"> Use PNG</label>
		<input id="svg" value="svg" type="radio" name="filetype" class="filetype" /><label for="svg"> Use SVG</label>
	</div>
	<div id="explanation">
    <p>Using SVGs for sprites results in much worse performance in browsers. Try changing between PNG and SVG in the box above and watch the framerate drop.</p>
    <p>Get in touch on Twitter if you have any questions: @adrianosmond</p>
    <p>Aug 23rd 2013 - this has been fixed in Chrome.</p>
    <p>Mar 24th 2014 - also fixed in Firefox.</p>
	</div>
	<div id="container" class="png">
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		<span class="icon cablecar-icon"></span>
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		<span class="icon dlr-icon"></span>
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		<span class="icon form-tooltip-icon"></span>
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		<span class="icon tube-icon"></span>
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		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
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		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
		<span class="icon home-icon"></span>
		<span class="icon right-arrow"></span>
		<span class="icon down-arrow"></span>
		<span class="icon plus-icon"></span>
		<span class="icon minus-icon"></span>
		<span class="icon warning-icon"></span>
		<span class="icon error-icon"></span>
		<span class="icon capped-icon"></span>
		<span class="icon oyster-tap-icon"></span>
		<span class="icon contactless-icon"></span>
		<span class="icon oyster-card-icon"></span>
		<span class="icon to-icon"></span>
		<span class="icon card-icon"></span>
		<span class="icon calendar-icon"></span>
		<span class="icon document-icon"></span>
		<span class="icon spreadsheet-icon"></span>
		<span class="icon bullet-icon"></span>
		<span class="icon form-tooltip-icon"></span>
		<span class="icon crosshair-icon"></span>
		<span class="icon tube-icon"></span>
		<span class="icon bus-icon"></span>
		<span class="icon rail-icon"></span>
		<span class="icon river-icon"></span>
		<span class="icon dlr-icon"></span>
		<span class="icon tram-icon"></span>
		<span class="icon mail-icon"></span>
		<span class="icon phone-icon"></span>
		<span class="icon email-icon"></span>
		<span class="icon cablecar-icon"></span>
		<span class="icon up-stairs-icon"></span>
		<span class="icon down-stairs-icon"></span>
		<span class="icon up-escalator-icon"></span>
		<span class="icon down-escalator-icon"></span>
		<span class="icon no-zone-1-icon"></span>
		<span class="icon up-ramp-icon"></span>
		<span class="icon down-ramp-icon"></span>
		<span class="icon up-lift-icon"></span>
		<span class="icon down-lift-icon"></span>
		<span class="icon accessible-icon"></span>
		<span class="icon inverse-accessible-icon"></span>
		<span class="icon pushchair-icon"></span>
		<span class="icon luggage-icon"></span>
		<span class="icon elderly-icon"></span>
		<span class="icon disabled-icon"></span>
		<span class="icon headphones-icon"></span>
		<span class="icon family-icon"></span>
	</div>
            
          
!

CSS

            
              body {
	font-family: Arial, sans-serif;
}

#container {
	max-width: 800px;
	margin: 0 auto;
}

#radios, #explanation {
	position: fixed;
	background-color: #fff;
	border: 1px solid #ccc;
}

#radios { 
	padding: 15px;
}

#explanation {
	top: 100px;
	width: 200px;
	padding: 0 15px;
}

#png, label[for='png'] {
	margin-bottom: 15px;
}

label:after {
	content:"";
	display: block;
}

$icon-width: 32px;
$icon-height: 32px;
$sprite-rows: 42;
$sprite-cols: 3;

@mixin sprite-position($row, $col) {
	background-position: (-1 * $icon-width * ($col - 1) ) (-1 * $icon-height * ($row - 1));
}

.icon {
	float: left;
	margin: 10px;
    background-image: url('http://adrianosmond.com/images/sprite.png');
    background-size: $sprite-cols*$icon-width $sprite-rows*$icon-height;
    width: $icon-width;
    height: $icon-height;
    display: block;
    &.vertically-centred {
		margin-top: -1 * ($icon-height / 2);
    }
}

.svg .icon {
	background-image: url('http://adrianosmond.com/images/sprite.svg');
}

.home-icon {
	@include sprite-position(4, 2);
}

.right-arrow {
	@include sprite-position(21, 1);
	right: 0;
}

.down-arrow {
	@include sprite-position(22, 1);
}

.plus-icon {
	@include sprite-position(23, 1);
}

.minus-icon {
	@include sprite-position(24, 1);
}

.warning-icon {
	@include sprite-position(27, 1);
}

.error-icon {
	@include sprite-position(27, 2);
}

.capped-icon {
	@include sprite-position(42, 3);
}

.expand-collapse-icon {
	@include sprite-position(23, 2);
}

.oyster-icon {
	@include sprite-position(15,3);
}

.oyster-tap-icon {
	@include sprite-position(14,3);
}

.contactless-icon {
	@include sprite-position(13,3);
}

.oyster-card-icon {
	@include sprite-position(41,1);
}

.to-icon {
	@include sprite-position(41,2);
}

.card-icon {
	@include sprite-position(40,3);
}

.calendar-icon {
	@include sprite-position(41,3);
}

.tick-icon {
	@include sprite-position(7,2);
}

.document-icon {
	@include sprite-position(7,3);
}

.spreadsheet-icon {
	@include sprite-position(6,3);
}

.bullet-icon {
	@include sprite-position(37,1);
}

.form-tooltip-icon {
	@include sprite-position(12,3);
}

.crosshair-icon {
	@include sprite-position(1,1);
}

.tube-icon {
	@include sprite-position(34,1);
}

.bus-icon {
	@include sprite-position(11,1);
}

.rail-icon {
	@include sprite-position(12,1);
}

.river-icon {
	@include sprite-position(13,1);
}

.dlr-icon {
	@include sprite-position(14,1);
}

.tram-icon {
	@include sprite-position(15,1);
}

.mail-icon {
	@include sprite-position(37,3);
}

.phone-icon {
	@include sprite-position(39,3);
}

.email-icon {
	@include sprite-position(38,3);
}

.cablecar-icon {
	@include sprite-position(16,1);
}

.up-stairs-icon {
	@include sprite-position(28,1);	
}

.down-stairs-icon {
	@include sprite-position(29,1);	
}

.up-escalator-icon {
	@include sprite-position(30,1);	
}

.down-escalator-icon {
	@include sprite-position(31,1);	
}

.no-zone-1-icon {
	@include sprite-position(32,1);	
}

.up-ramp-icon {
	@include sprite-position(33,1);	
}

.down-ramp-icon {
	@include sprite-position(33,2);	
}

.up-lift-icon {
	@include sprite-position(33,3);	
}

.down-lift-icon {
	@include sprite-position(29,3);	
}

.accessible-icon {
	@include sprite-position(32,3);	
}

.inverse-accessible-icon {
	@include sprite-position(32,2);	
}

.pushchair-icon {
	@include sprite-position(29,2);	
}

.luggage-icon {
	@include sprite-position(31,2);	
}

.elderly-icon {
	@include sprite-position(30,2);	
}

.disabled-icon {
	@include sprite-position(30,3);	
}

.headphones-icon {
	@include sprite-position(31,3);	
}

.family-icon {
	@include sprite-position(28,2);	
}
            
          
!
? ?
? ?
Must be a valid URL.
+ add another resource
via CSS Lint

JS

            
              /*
 The code here was put together very quickly in order to demonstrate the issue that all things being equal, SVG performs worse than PNG when used as background images in sprites. For more on the thought process behind this, read http://adrianosmond.com/using-svg-for-sprites-a-cautionary-tale/ or get in touch on Twitter: @adrianosmond.
 */

    var $radios = $(".filetype");
		var $container = $("#container");
		var changeRadios = function () {
			$container.attr("class", $(this).val());
		};
		$radios.change(changeRadios);
		var scrollTime = 10000;
		var scrollDown = function() {
			$("html, body").animate({ scrollTop: "2000px" }, scrollTime);	
		};

		var scrollUp = function() {
			$("html, body").animate({ scrollTop: "0px" }, scrollTime);	
		};
		
		scrollDown();
		setInterval(scrollDown, 2 * scrollTime);
		setTimeout(function() {
			scrollUp()
			setInterval(scrollUp, 2 * scrollTime);
		}, scrollTime);
            
          
!
Must be a valid URL.
+ add another resource
via JS Hint
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