The javascript styling can be used to override the XML markup.

	<link type="text/css" rel="stylesheet" href="/js/yui/build/cssfonts/fonts-min.css" /> 
	<script type="text/javascript" src="/js/raphael/raphael-min.js" ></script> 
	<script type="text/javascript" src="/js/yui/build/yui/yui.js"></script> 
	<script type="text/javascript" src="/js/jsphylosvg-min.js"></script> 
	<!-- unitip -->
	<link rel="stylesheet" type="text/css" href="/js/unitip/css/unitip.css" > 
	<script type="text/javascript" src="/js/unitip/js/unitip.js"></script> 	
	<script type="text/javascript">
	window.onload = function(){
		YUI().use('oop', 'json-stringify', 'io-base', 'event', 'event-delegate', function(Y){
			var uri = "/trees/2-coffee.xml";
			function complete(id, o, args) {
				var data = o.responseXML; // Response data.
				var dataObject = {
							xml: data,
							fileSource: true
				Smits.PhyloCanvas.Render.Style.line.stroke = 'rgb(0,0,255)';	// Color lines blue
				Smits.PhyloCanvas.Render.Style.text["font-size"] = 16;			// Increase font size to 16pt				
				phylocanvas = new Smits.PhyloCanvas(
					800, 800
				init(); //unitip
			Y.on('io:complete', complete, Y);
			var request =;
	<div id="svgCanvas"> </div>

download version 1.55 here
If you use jsPhyloSVG, please be sure to cite us:
Smits SA, Ouverney CC, 2010 jsPhyloSVG: A Javascript Library for Visualizing Interactive and Vector-Based Phylogenetic Trees on the Web.
PLoS ONE 5(8): e12267. doi:10.1371/journal.pone.0012267

You might also be interested in Phylometrics.