The html4/replaced-intrinsic-ratio-001 test fails.
With luck, fixing this should be as simple as it was for Gecko. All they had to do was remove the code that pretended there was such a thing as "percentage intrinsic widths" (because there isn't).
Gecko bug: https://bugzilla.mozilla.org/show_bug.cgi?id=611099
This might be useful: http://rickmasters.org/tests/browser-tests/sizing/controller.html
15849 fixes this bug. That makes us the only big browser supporting it for real out of Opera/FF/IE9. FF plans to add support for it soon, MS as well in IE10, not sure about Opera.
Oh, I forgot to clear this bug. This was landed in r88913 and is fixed in trunk.