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The list of supported operations in: https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#algorithms-index Does not indicate any algorithms as supporting wrapKey/unWrapKey. Whereas the per-algorithm table for RSA-OAEP does list them: https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#rsa-oaep I suggest resolving this inconsistency and either list them in both places, or none.