Re: [w3c/manifest] WIP: beforeinstallprompt (#506)

marcoscaceres commented on this pull request.



> +          </li>
+          <li>Let <var>prompt promise</var> be the promise corresponding to the
+          event's prompt() method.
+          </li>
+          <li>Let <var>user-choice promise</var> be the promise corresponding
+          to the event's <code>prompt()</code> method.
+          </li>
+          <li>Fire <var>event</var> at the <code>Window</code> object.
+          </li>
+          <li>Queue a task on the Realm’s settings object’s responsible event
+          loop:
+            <ol>
+              <li>If <var>event</var>'s <a>cancel flag</a> is set, terminate
+              this algorithm.
+              </li>
+              <li>Otherwise, attempt to present the end-user with a UI that

The user might have set a preference to say "I never want to install apps". Or something else... basically, it's not assured that the operation will succeed, resulting in an exceptionally rejected promise. 

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