public SELF attribute_$_has_value_$(String attribute, String content) {
        assertThat(foundElement.getAttribute(attribute)).isEqualTo(content);
        return self();
    }
@param index the ordinal number of this element, starting at 1.
jgiven-tests/src/test/java/com/tngtech/jgiven/report/html5/ThenHtml5App.java