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Re:Push API – W3C Working Draft by mmastrac on Monday October 27, 2014 @10:32AM (#8515619)
The new web APIs are promise-ified by default rather than using the callback model of the past. So rather than register(callback), it's register().then(...).

Whether this is a good thing or not is another question I don't know the answer to.

Re:Push API – W3C Working Draft by smanuel on Monday October 27, 2014 @10:45AM (#8515715)
My comment was mainly about serviceWorker.ready.then. I've never seen a JS API using such pattern - the name of the event as a property which is a promise.

A manager object/class also usually rings a bell.

Not that I'm an API specialist but I would rather implement it as:

document.addEventListener("serviceready", function() {

window.pushNotification.register().then(.....

Re:Push API – W3C Working Draft by AgentME on Monday October 27, 2014 @01:01PM (#8516667)
For an event that only happens once, then the

    navigator.serviceWorker.ready.then(function(){...
version is preferable to

    document.addEventListener("serviceready", function() {
because A) you don't have to worry about removing your event listener after the fact, and B) if the event has already happened, then your callback will be called immediately.