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For developing FLEDGE [0], we'd be interested in enums that don't throw, since we have several "enums" that will grow as we add new functionality. Often, feature detection seems like...

FYI, we're continuing to see test flakes in Chromium that may be caused by this issue: [crbug.com/41496717](http://crbug.com/41496717).

See https://github.com/speced/bikeshed/issues/2855 -- this may require changing the HTML diff service (which isn't in Bikeshed) to somehow avoid altering the mouseover effect for the diff elements it modifies. This bug...