SVG alternative to fittext.js, see http://dabblet.com/gist/5231222

dabblet.css

/* SVG alternative to fittext.js */

div {
	width: 300px;
	height: 150px;
	float: left;
	margin-right : 10px;
	background: #f06;
	font: bold 150% sans-serif;
	text-shadow: 0 1px 2px rgba(0,0,0,.5);
	overflow: hidden; resize: both; /* just for this demo */
	margin-bottom : 26px;
}
div:nth-child(3){ background: #004eff; }

svg {
	width: 100%; height: 100%;
	pointer-events: none; /* so that you can resize the element */
}

text {
	fill: white;
	text-anchor: middle;
	pointer-events: auto; /* Cancel the svg’s pointer-events */
}

p {
	font: italic 100% Georgia, serif;
}

.sources{
	font-family: Palatino Linotype, Book Antiqua, Palatino, serif;
	position:relative;
	display:block;
	clear : both;
	width : 100%;
	color : #2051c0;
	line-height : 1.5em;
	text-decoration : none;	
	text-shadow: 0px 4px 2px rgba(0, 0, 0, 0.16);
}

span.sources{
	color : #444;
	padding-top : 2px;
	padding-bottom : 8px;
	border-top : 1px #ddd solid;
}

span.sources:before{ content: ": "; }
span.sources:after{ content: " "; }

.sources:before{
	content:"{ ";
	font-size : 1.2em;

	line-height : 1.5em;
	color : #ccc;
	text-shadow: none;
}
.sources:after{
	content:" }";
	font-size : 1.2em;

	line-height : 1.5em;
	color : #ccc;
	text-shadow: none;
}

dabblet.html

<!-- SVG alternative to fittext.js -->
<p>
	Resize the div below from the handle at the bottom right corner (if your browser supports the <code>resize</code> CSS property)
	or change the CSS code to observe what happens at different dimensions.
</p>
<div>
	<svg><text x="50%" y="50%" dy=".3em">Look, I’m centered!</text></svg>
</div><div>
	<svg viewBox="-50 -50 100 100" preserveAspectRatio="xMidYMid meet"><text font-size="16" dy=".3em" >I’m also resizeable!</text></svg>
</div>
<span class="sources">
Original Gist: <a href="http://lea.verou.me/2013/03/easily-center-text-vertically-with-svg/">lea verou's "Easily center text vertically, with SVG!"</a><br/>
I've adapted the code to create a pure-SVG alternative to <a href="http://fittextjs.com/">fittext.js</a><br/>
I assume that the resizing itself will always be proportional, otherwise you'll have to change the preserveAspectRatio attribute to fit your needs.<br/>
</span>
	
<span class="sources">Sources</span>
<a href="http://www.justinmccandless.com/blog/Making+Sense+of+SVG+viewBox's+Madness" class="sources">Making Sense of SVG viewBox's Madness</a>
<a href="http://www.sitepoint.com/svg-styling-with-css/" class="sources">How to Style Scalable Vector Graphics Using CSS</a>
<a href="http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute" class="sources">The ‘preserveAspectRatio’ attribute</a>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"html"}