clean up the white-space text

        <pre data-sub="prettyprint:_">
        document.documentElement.firstChild.nextSibling.firstChild;
        </pre>


        Sometime the above works in IE, but not work in FireFox, because IE ignore the whitespace text, but fireFox does not to solve this problem you need to call this
        function, before access it.

        <pre data-sub="prettyprint:_">

        function cleanWhitespace( element ) {
        element = element || document;
        var cur = element.firstChild;
        while ( cur != null )
        {
        if ( cur.nodeType == 3 && ! /\S/.test(cur.nodeValue) )
        {
        temp = cur;
        cur = cur.nextSibling;
        temp.parentNode.removeChild(temp);
        }
        else
        {
        if ( cur.nodeType == 1 )
        {
        cleanWhitespace( cur );
        }
        cur = cur.nextSibling;
        }
        }
        }
        </pre>