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Please add id="" to: Opaque identifiers Tuples Aliases https://html.spec.whatwg.org/multipage/browsers.html#origin
This is a good first bug for a pull request at https://github.com/whatwg/html. It would probably involve wrapping those list items with something like `<dfn data-x="concept-origin-opaque-identifier">` etc.
https://github.com/whatwg/html/pull/627