This test checks getBoundingClientRect() on rectangles On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Checking a rectangle of absolute size at absolute coordinates: PASS r1.left is 20 PASS r1.top is 30 PASS r1.width is 40 PASS r1.height is 50 PASS r1.right is 60 PASS r1.bottom is 80 Checking a resized rectangle at relative coordinates: PASS r2.left is 180 PASS r2.top is 15 PASS r2.width is 160 PASS r2.height is 25 PASS r2.right is 340 PASS r2.bottom is 40 Checking rectangles with overflow: PASS r3.left is 300 PASS r3.top is 0 PASS r3.width is 210 PASS r3.height is 50 PASS r3.right is 510 PASS r3.bottom is 50 PASS r4.left is 300 PASS r4.top is 50 PASS r4.width is 210 PASS r4.height is 60 PASS r4.right is 510 PASS r4.bottom is 110 PASS successfullyParsed is true TEST COMPLETE