This is a test to make sure ch units work as intended. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS document.getElementById("box_mono_zero").clientWidth is 0 PASS document.getElementById("box_mono_four1").clientWidth is document.getElementById("box_mono_four2").clientWidth PASS document.getElementById("box_monofallthrough_four1").clientWidth is document.getElementById("box_monofallthrough_four2").clientWidth PASS document.getElementById("mono_box_alphalen1").clientWidth is document.getElementById("mono_box_alphalen2").clientWidth PASS document.getElementById("box_one").clientWidth * 26 is document.getElementById("box_alphalen").clientWidth PASS document.getElementById("arial_box_one").clientWidth * 26 is document.getElementById("arial_box_alphalen").clientWidth PASS document.getElementById("helvetica_box_one").clientWidth * 26 is document.getElementById("helvetica_box_alphalen").clientWidth PASS document.getElementById("times_box_one").clientWidth * 4 is document.getElementById("box_times_four").clientWidth PASS document.getElementById("arial_box_one").clientWidth * 4 is document.getElementById("box_arial_four").clientWidth PASS document.getElementById("helvetica_box_one").clientWidth * 4 is document.getElementById("box_helvetica_four").clientWidth PASS document.getElementById("ref_box_arial_one").clientWidth is >= document.getElementById("box_arial_one").clientWidth PASS document.getElementById("ref_box_times_one").clientWidth is >= document.getElementById("box_times_one").clientWidth PASS document.getElementById("ref_box_sansserif_one").clientWidth is >= document.getElementById("box_sansserif_one").clientWidth PASS w1 !== w2 || h1 !== h2 is false PASS ps1h > ps2h && ps1h > ps3h is true PASS document.getElementById("box_mono_one").clientWidth is document.getElementById("box_mono").clientWidth PASS successfullyParsed is true TEST COMPLETE This is a test to make sure ch units work as intended. You should not see anything red on this page. Only 'PASS' should be visible: PASS PASS PASS PASS The whole lower case alphabet should be readable: abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvwxyz Four zeroes should be visible, nothing else: 0000 0000 0000 There should be more than one green '|' visible (non-monospaced fonts): |||0||| |||0||| |||0||| This box has a 20px font size. The last two '0's should be the same size. 0 0 0 I'm a pseudo selected first line, I should be bigger than the rest. I'm the second line. Last in line. But one day... the throne will be mine! 0