<!DOCTYPE html>
<head>
    <meta charset="utf-8">
    <style>
        body {
            color: red;
            font-family: sans-serif;
        }
    </style>
</head>
<body>
    <script src="http://d3js.org/d3.v2.js"></script>
    <script>
        var a = 5; //global scope is forced without the use of var

        function return_global_a() {
            return a;
        }
        function return_global_b() {
            return b;
        }

        function test1() {
            console.log("a in functi