Tests offsetWidth using min-width and max-width
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS testWidth("max-width:150px") is 100
PASS testWidth("max-width:50px") is 50
PASS testWidth("min-width:150px") is 150
PASS testWidth("min-width:50px") is 100
PASS successfullyParsed is true
TEST COMPLETE