function prefixedElementClassNames(node)
    {
        var classAttribute = node.getAttribute("class");
        if (!classAttribute)
            return [];

        return classAttribute.split(/\s+/g).filter(Boolean).map(function(name) {
            // The prefix is required to store "__proto__" in a object-based map.
            return "$" + name;
        });
    }
@param {!WebInspector.DOMNode} node
@return {!Array.<string>}