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

kenchris commented on this pull request.



> +   * @param  {Element} element A DOM element that simulates the pop-up.
+   * @return {Promise<void>} Resolves when user makes a choice.
+   */
+  async function requestInstallPrompt(event, element) {
+    const internal = internalSlots.get(event);
+    internal.didPrompt = true;
+    const promptOutcome = await showInstallPrompt(element);
+    internal.userChoiceResolver(promptOutcome);
+  }
+
+  /**
+   * Implementation of BeforeInstallPromptEvent.
+   *
+   */
+  class BeforeInstallPromptEvent extends Event {
+

unneeded newline

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