This tests that the specified height is honored (*) for and elements. (*) The Mac ports ignore the specified height for elements unless a border and/or background CSS property is also specified (see the fifth button below). Disregarding padding, they render the button with a height equal to the height of the font used for the button label. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS document.getElementById('button1').offsetHeight is document.getElementById('button2').offsetHeight PASS document.getElementById('button3').offsetHeight is 40 PASS document.getElementById('button4').offsetHeight is 40 PASS document.getElementById('button5').offsetHeight is correct for this platform. TEST COMPLETE