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by bcj 4656 days ago
I think an argument can be made for the difference between the stop timer, and the stop stopwatch.

Red (in those two cases) means stop, so the button turns red. Stopping a stopwatch is an expected action to perform, so the button remains white (to be consistent with start). Stopping a timer is an unexpected action—you are cancelling the timer. To denote this, they use dark grey.