tweakdata.js

/**
 * A map of adjustment values for margins on the text's bounding box to get the type sitting hard
 * against the edge of the box.
 */	
boundingBoxTweaks = 

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// Browser specific issue
if(navigator.userAgent.indexOf('WebKit') != -1) {
 	boundingBoxTweaks.Helvetica.top = -0.2;
}