{
    let text = rules[0].cssText;
    let rule = rules[0];
    assert_equals(text.indexOf("font-family"), -1);
    assert_equals(rule.fontFamily, "");
    rule.fontFamily = "SomeFontFamily";
    assert_equals(rule.fontFamily, "");
    assert_equals(rule.basePalette, "");
    rule.basePalette = "7";
    assert_equals(rule.basePalette, "");
    assert_throws_js(TypeError, function() {
        rule.clear();
    });
    assert_throws_js(TypeError, function() {
        rule.delete(4);
    });
    assert_throws_