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HTML

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>ASP4SD</title>
</head>
<body>
	<H1>Underflow</H1>
	<SCRIPT>
    var a = 1000000000000000000
  	do {
			var b = 2
			var c = 1
	    var result = ((a+b)-c)-a;
			document.write("<P>"+a+":");
			document.write(result);
			document.write("</P>");
    	a = a/10;
    } while (result < 1);
    document.write("<P>Digits of precision: "+Math.log(a)/Math.log(10)+"</P>");
	</SCRIPT>
</body>		
</html>