if (attr == null || !attrValue.equals(attr.getNodeValue())) {
                    return false;
                }
            }
            if (id == null) {
                if (css == null) {
                    return true;
                }
                final Node classAttr = node.getAttributes().getNamedItem("class");

        private final Map<String, Node> items = new HashMap<>();

        public void setNamedItem(String name, Node node) {
            items.put(name, node);
        }

        @Override
        public Node getNamedItem(String name) {
            return items.get(name);
        }

        @Override
        public Node setNamedItem(Node arg) {
            return null;
        }

        @Override

                        final NamedNodeMap attributes = node.getAttributes();
                        if (attributes != null) {
                            final Node classAttr = attributes.getNamedItem("class");
                            if (classAttr != null) {
                                final String value = classAttr.getNodeValue();
                                if (StringUtil.isNotBlank(value)) {

     * @return the thumbnail source URL if found, null otherwise
     */
    protected String getThumbnailSrc(final String url, final NamedNodeMap attributes) {
        final Node srcNode = attributes.getNamedItem("src");
        if (srcNode != null) {
            try {
                final URL thumbnailUrl = getURL(url, srcNode.getTextContent());
                if (thumbnailUrl != null) {