<script> /* likely Gecko-specific */ function flush_frames(elt) { getComputedStyle(elt, "").color; } var start = Date.now(); for (var i = 0; i < 10000; ++i) { test_elt.style.display = "none"; flush_frames(test_elt); test_elt.style.display = ""; flush_frames(test_elt); } var time = (Date.now() - start); </script>