Status: With significant refactoring (again, and again, and again) in DD174208 I have resolved the positioning issues with subregions by consistently transforming to SVG's concept of User Space on the Gecko side, and am working on the last few test failures. When this lands it will resolve some dozen or so bugs (including 2 WPT tests and a couple reftests).
Bug 1824502 Comment 7 Edit History
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Status: With significant refactoring (again, and again, and again) in D174208 I have resolved the positioning issues with subregions by consistently transforming to SVG's concept of User Space on the Gecko side, and am working on the last few test failures. When this lands it will resolve some dozen or so bugs (including 2 WPT tests and a couple reftests).