lue to <image>+ is not allowed');

test_specified_maps(function(map) {
    verify_map_no_append(map, generate_property('<integer>+'), CSS.number(1));
}, 'Appending a CSSUnitValue to <integer>+ is not allowed');

test_specified_maps(function(map) {
    verify_map_no_append(map, generate_property('<length-percentage>+'), CSS.px(10));
}, 'Appending a CSSUnitValue to <length-percentage>+ is not allowed');

test_specified_maps(function(map) {
    verify_map_no_append(map, generate_property('<length>+'), CSS.px(1