String elementName = scanner.region().toLowerCase(Locale.ROOT);
        if (isEnd) {
            visitor.onEndHtmlElement(elementName);
        } else {
            visitor.onStartHtmlElement(elementName);
        }

        // attributes
        scanner.skip(WHITESPACE_WITH_EOL);
        while (!scanner.isEmpty() && scanner.lookingAt(ELEMENT_ATTRIBUTE)) {
            // attribute name