I think we should log a separate bug to address the issue in the rules view. However, in my opinion unsupported properties _should_ show up as inherited. The `-webkit-text-size-adjust` behavior is correct, and `-ms-text-size-adjust` should show up as well. That would also be in line with Safari and Chrome.
Bug 1538728 Comment 4 Edit History
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I think we should log a separate bug to address the issue in the rules view. However, in my opinion unsupported properties _should_ show up as inherited. The `-webkit-text-size-adjust` behavior is correct, and `-ms-text-size-adjust` should show up as well. Knowing that it might not be technically correct, I think this is the best solution for the user. We would show the whole rule and cross out/grey out properties that don't apply. That would also be in line with Safari and Chrome. As a side effect, it would help to better explain the results of "copy rule".