Re: [w3ctag/design-reviews] Pointerevent extension (#346)

You need to define the actual architecture that makes that work. E.g., define that these events hold a pointer to some parent and redefine the target attribute's getter so it can sometimes return the some parent's target instead. That will make it possible to verify that it's safe and will ensure that other extensions don't clash with it. The actual implementation can still be different from that, as long as it's black-box indistinguishable.

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