Re: [w3c/webcomponents] How should various document internal references work when SVG is being used in shadow DOM (#179)

> CSS values that contain URLs are already made absolute based on their source file.

Not true if they're fragment-only; those are kept as fragments and are always a local reference. They'd be affected by this.

> URLs and inheritance are still an issue, of course, especially to keep SVG use-element shadow trees working in a backwards-compatible way.

Yup, this is exactly the issue. The value needs a way to indicate which tree the reference is resolved against, when it inherits in from a higher shadow tree. Whether the referencing syntax is via an ident or a fragment doesn't change things.

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