Discovered last week: @.supports (transition-property: nonsense) returns true in Chrome. But Chromium 34 and below return false.
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I found a false positive in Firefox @support {appearance: none} in version 33. The browsers really need to be careful with that.
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Replying to @jnowland @ppk
I think the issue you're seeing is that we've had to add more behaviors to -moz-appearance:none, copying other browsers.

Jul 6, 2016 路 2:41 AM UTC

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Replying to @davidbaron @jnowland @ppk
You can't test for a specific effect that it has, only whether it's accepted, which should mean it does something (it did)
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The 'appearance' property specifically is a mess; there's no spec for form controls or how 'appearance' affects them.
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