@domenic, `[[waitForUpdate]]` is an internal slot in `PaymentRequestUpdateEvent`. I believe it gets flipped when someone calls `updateWith` from within an event handler so that: 1. An invalid state exception will be thrown if `updateWith` is called more than once. 2. As a guard that will prevent event handling from completing until unset again. https://github.com/domenic/browser-payment-api/blob/85074dda44c64c088f87f961ac503783dc22114b/index.html#L1623-L1624 I believe its analog is the "[wait to respond flag](https://www.w3.org/TR/service-workers/#wait-to-respond-flag)" used in the fetch spec's [respondWith method](https://www.w3.org/TR/service-workers/#fetch-event-respondwith-method). -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/w3c/browser-payment-api/issues/371#issuecomment-273657109
Received on Thursday, 19 January 2017 01:38:40 UTC