rast(2)', {prop:'filter'});
test_math_used('contrast(calc(sign(1em - 1px) * 2%))', 'contrast(2%)', {prop:'filter'});
test_math_used('hue-rotate(calc(sign(1em - 1px) * 2deg))', 'hue-rotate(2deg)', {prop:'filter'});

</script>

