Structured serialization of DOMPoint / DOMMatrix is not supported. Spec: https://drafts.fxtf.org/geometry/#structured-serialization This is covered by: imported/w3c/web-platform-tests/css/geometry-1/structured-serialization.html
Safari Technology Preview 181 is passing all WPT tests: https://wpt.fyi/results/css/geometry/structured-serialization.html?label=experimental&label=master&aligned= Live Link - http://wpt.live/css/geometry/structured-serialization.html Do we need to do anything here?