This would not be able to happen cross-origin at all, fwiw. Also generally cross-document selector-matching seems like a huge can of worms... Gecko does have some limited support for styling embedded SVGs using -moz-context-properties: https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-context-properties But I'm not sure of the history of those and how they work perf-wise and such. Maybe @jwatt can comment? -- GitHub Notification of comment by emilio Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3730#issuecomment-472637736 using your GitHub accountReceived on Wednesday, 13 March 2019 22:53:43 UTC
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