Discovered last week: @.supports (transition-property: nonsense) returns true in Chrome. But Chromium 34 and below return false.

I found a false positive in Firefox @support {appearance: none} in version 33. The browsers really need to be careful with that.

have a url or testcase? Works fine for me on nightly.

I've got firefox 33 installed on my machine. codepen.io/jnowland/pen/bpJX… - this appears yellow. New firefox is fine.