[Gecko Bug 1565557] ResizeObserver for SVG elements with CSS layout boxes use the layout boxes. #35437
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As per the CSSWG resolution here: w3c/csswg-drafts#4032
Previously, any and all SVG elements used its SVG object bounding box. Now, SVG
elements that have their own CSS layout box use them. These match the following
CSS rules:
svg:root, *:not(svg|*) > svg, svg|foreignObject > svg
Differential Revision: https://phabricator.services.mozilla.com/D154246
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1565557
gecko-commit: 742e5698d74fd51b30049622b9beaf963e8cefc0
gecko-reviewers: emilio