Bug 1118710 comment 13, Robert's comment: CSS transforms are not supported in indirectly rendered things such as masks, patterns or clip-paths because the rendering is done outside of a display list.
I think the correct solution might be to build up display list and paint that list(using nsLayoutUtils::PaintFrame) inside nsSVGMaskFrame::GetMaskForMaskedFrame
How does this bug differ from bug 1118710?
Possible test case: https://codepen.io/thebabydino/pen/vjWdPx
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