Created
May 30, 2012 09:09
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GDI vs. good font rendering detection
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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>GDI vs. good font rendering detection</title> | |
<script> | |
// Anonymous function - prevents collisions | |
(function(){ | |
var fragment = document.createDocumentFragment(); // Creating a DOM fragment off the DOM | |
var outerdiv = document.createElement('div'); | |
outerdiv.style.cssText = 'font:normal 10px arial;position:absolute;left:-40em;top:-10em;'; | |
fragment.appendChild(outerdiv); | |
var innerdiv = document.createElement('div'); | |
innerdiv.style.cssText = 'color:#fff;float:left;font-size:33.3333%;'; | |
innerdiv.textContent = 'This is a text written in Arial'; | |
outerdiv.appendChild(innerdiv); | |
//document.body.insertBefore(fragment, document.body.childNodes[0]); // Appending fragment | |
document.getElementsByTagName('head')[0].appendChild(fragment); | |
var width = window.getComputedStyle ? window.getComputedStyle(innerdiv,null).getPropertyValue('width') : '44px'; // Measuring width | |
document.getElementsByTagName('head')[0].removeChild(outerdiv); // Removing fragment | |
if(width === '44px'){ | |
document.documentElement.className += ' gdi'; | |
} else { | |
document.documentElement.className += ' no_gdi'; | |
} | |
})(); | |
</script> | |
</head> | |
<body> | |
<h1>GDI vs. "good" font rendering detection</h1> | |
<h2>Look at my source, my source is amazing</h2> | |
<p>If GDI (or quivalent) font rendering is used in your current browser a class named "gdi" will have been added to the HTML element. Otherwise the classname is "no_gdi" (e.g. if it's DirectWrite or Quartz).</p> | |
</body> | |
</html> |
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