This tests that we don't incorrectly wrap an auto-layout table due to improper truncation of sub-pixel accumulation. See Bug 93911. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS document.getElementById('testCell').offsetHeight + 'px' is getComputedStyle(document.getElementById('testCell')).lineHeight PASS successfullyParsed is true TEST COMPLETE