1 All boxes below should be 100px * 100px and green.
6 50px + 50px (2 spaces around operator) => PASS
7 150px - 50px (2 spaces around operator) => PASS
18 50px*(12 - 10) => PASS
21 50px + 10px * 5 (operation order) => PASS
22 100%/2 (where 100% is 200px) => PASS
23 100% + -100px (where 100% is 200px) => PASS
24 80% - 60px (where 100% is 200px) => PASS
25 300px - 100% (where 100% is 200px) => PASS
26 -100px + 100% (where 100% is 200px) => PASS
27 20% + 30% (where 100% is 200px) => PASS
28 80% - 30% (where 100% is 200px) => PASS
29 10% * 5 (where 100% is 200px) => PASS
30 5 * 10% (where 100% is 200px) => PASS
36 50px + 25px * 2 => PASS
37 (25px + 25px) * 2 => PASS
40 (1em - 1em) + 100px => PASS
43 -50px - -150px => PASS
44 (((((((100px))))))) => PASS