Interesting error reporting difference in Chrome and Firefox

Ok, perhaps "interesting" is a bit of a stretch, but as I'm doing some work while waiting for new tires to be put on my car, my base level for "interesting" is a bit lower than normal. I'm testing some code that I wrote in a Powerpoint slide - code I was sure worked fine but I wanted to be really sure, and I found that I had a typo. Consider the snippet below - you will probably see it right away.

$.getJSON("/data.json", function(res) {
    var s = "<ul>";
    for(var i=0;i<res.length;i++) {
        if(res[i].length < 4) {
            s+="<li class=\"short\">"+res[i] + "</li>");
        } else {
            s+="<li>"+res[i] + "</li>");
    s += "</ul>";

When I ran this in Firefox, I got: SyntaxError: missing ; before statement test1.html:22.

Line 22 is the line that adds the li with class short to the variable s. I looked at it and couldn't quite figure out what was wrong.

I then switched to Chrome and got this error: Uncaught SyntaxError: Unexpected token )

Now - that made sense! I immediately saw the extra ) I had at the end of my line. (I also had it two lines later.)

But what I found interesting is how different the errors were. Both were syntax errors, but the actual detail was quite different. Anyone have an idea as to why this is?

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