mber('progress(0,, 0)');
test_invalid_number('progress(to,,,,)');
test_invalid_number('progress(0,,, 10,, 200)');
test_invalid_number('progress(0,,, 10,,, 200)');
test_invalid_number('progress(0,, 10,, 200)');
test_invalid_number('progress(0 from 10 to 200)');

// General tests
test_invalid_number('progress(5%, 0, 8');
test_invalid_number('progress(5%, 0deg, 8deg');
test_invalid_number('progress(5, 0deg, 8deg');
test_invalid_number('progress(5, 0%, 8deg');
test_invalid_number('progress(5, 0%, sign(10px)');
