Tests that the -webkit-columns shorthand is computed properly.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

PASS computedStyle.getPropertyValue('-webkit-columns') is "10px 2"
PASS computedStyle.getPropertyValue('-webkit-columns') is "10px"
PASS computedStyle.getPropertyValue('-webkit-columns') is "2"
PASS computedStyle.getPropertyValue('-webkit-columns') is "2"
PASS computedStyle.getPropertyValue('-webkit-columns') is "auto"
PASS computedStyle.getPropertyValue('-webkit-columns') is "10px"
PASS successfullyParsed is true

TEST COMPLETE