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The spec doesn't say to throw WRONG_DOCUMENT_ERR anywhere. Should it be marked historical, or are there users in other specs? APIs have mostly been updated to silently adopt nodes from the wrong document, so perhaps it's not needed anymore.
I was searching for WRONG_DOCUMENT_ERR instead of WrongDocumentError. smaug____ points out that it actually is used, e.g., in isPointInRange().