transparent backgournd color is actually not supported, since window is not transparent on win10 Firefox. Then the transparent color becomes white without compositor window.
Bug 1564514 Comment 10 Edit History
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transparent backgournd color is actually not supported, since window is not transparent on win10 Firefox. Then the transparent color becomes white without compositor window. With compositor window, rendering is done to compositor window. Then root window seemed to appear as black.
transparent backgournd color is actually not supported, since window is not transparent on win10 Firefox. Then the transparent color becomes white without compositor window.