termkit/font_aspect_ratio.html at master · calledit/termkit · GitHub

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<html>
	<head>
		<title>Font Aspect Ratio</title>
		<style>
		#testletterholder{
			float:left;
		}
		</style>
	</head>
	<body>
		<div id="testletterholder"></div>
		<div style="clear:both;"></div>
		<div>Aspect ratio is:</div>
		<div id="test_result"></div>

		<script>
		var FontSize = 12;
		var div_holder = document.getElementById("testletterholder");
		div_holder.innerHTML = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
		div_holder.style.fontFamily = "courier";
		div_holder.style.lineHeight = "1";
		div_holder.style.fontSize = (FontSize*10)+"px";
		setTimeout(function(){
			HolderStyle =  window.getComputedStyle(div_holder, null);
			var Width = HolderStyle.width.replace(/[^0-9]/g, "")/div_holder.innerHTML.length;
			var Height = HolderStyle.height.replace(/[^0-9]/g, "");
			var AspectRatio = Width/Height;
			document.getElementById("test_result").innerHTML =  AspectRatio;
		},10);
		</script>
	</body>
</html>