What are unused variables set to?
<p>Particularly for <code>localStorage.foo</code></p>

<p>For Safari it is set to:</p>

<pre><code>undefined
</code></pre>

<p>For Firefox it is set to:</p>

<pre><code>null
</code></pre>

<p>Does anyone know the values for Chrome and IE?</p>

<p>Why is it different?  Just random choices by browser programmers?</p>
