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As per the discussion in #317, I believe that ineligible resources should fail open, not closed. More specifically, since a CORS failure because of a lack of CORS headers from the server will result in a network error (and thus SRI will never be activated), this has the practical effect that if a developer forgets to add the crossorigin attribute, the integrity should not be enforced. Thoughts @devd @mozfreddyb @fmarier?