Use the substring method:
var length = 3; var myString = "ABCDEFG"; var myTruncatedString = myString.substring(0,length); // The value of myTruncatedString is "ABC"
So in your case:
var length = 3; // set to the number of characters you want to keep var pathname = document.referrer; var trimmedPathname = pathname.substring(0, Math.min(length,pathname.length)); document.getElementById("foo").innerHTML = "<a href='" + pathname +"'>" + trimmedPathname + "</a>"
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