Re: [svgwg] Clarify <iframe> behavior in <svg:use> (#876)

> The shadow tree is open (inspectable by script), but read-only. Any attempt to directly modify the elements, attributes, and other nodes in the shadow tree must throw a NoModificationAllowedError.

I don't think this matches any browser. Strong preference to spec that the shadow tree is closed. Otherwise this needs sweeping changes around all DOM APIs which has performance implications and is a huge whack-a-mole.

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Received on Thursday, 19 March 2026 09:30:05 UTC