Tests that the html element excludes scrollbars when reporting clientWidth and clientHeight, and that it implements scroll() by scrolling the frame.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS htmlElement.clientWidth is innerWidth - 20
PASS htmlElement.clientHeight is innerHeight - 20
PASS scrollX is 10
PASS scrollY is 10
PASS successfullyParsed is true
TEST COMPLETE