Fix: use 'fire an event' + drop BeforeInstallPromptEventInit

index.html

@@ -399,18 +399,17 @@ <h2>
             <a>Queue a task</a> on the <a>application life-cycle task
             source</a> to do the following:
             <ol>
-              <li>Let <var>event</var> be a <a data-lt=
-              "construct a BeforeInstallPromptEvent">newly constructed</a> <a>
-                BeforeInstallPromptEvent</a> named
-                "<a>beforeinstallprompt</a>", which is cancelable.
+              <li>Let <var>target</var> be at <a>Window</a> object of the
+              <a>top-level browsing context</a>.
               </li>
-              <li>
-                <a>Fire</a> <var>event</var> at the <a>Window</a> object of the
-                <a>top-level browsing context</a>.
+              <li>Let <var>showPrompt</var> be the result of <a>firing an
+              event</a> (<var>event</var>) named "beforeinstallprompt", using
+              <a>BeforeInstallPromptEvent</a> at <var>target</var> with its
+              <code>cancelable</code> attribute initialized to true.
               </li>
-              <li>If <var>event</var>'s <a>canceled flag</a> is not set, then,
-              <a>in parallel</a>, <a>request to present an install prompt</a>
-              with <var>event</var>.
+              <li>If <var>showPrompt</var> is true, then, <a>in parallel</a>,
+              <a>request to present an install prompt</a> with
+              <var>event</var>.
               </li>
             </ol>
           </li>
@@ -495,15 +494,10 @@ <h3>
           <code>BeforeInstallPromptEvent</code> Interface
         </h3>
         <pre class="idl">
-          [Constructor(DOMString typeArg, optional BeforeInstallPromptEventInit eventInit)]
+          [Constructor]
           interface BeforeInstallPromptEvent : Event {
               Promise&lt;PromptResponseObject&gt; prompt();
           };
-
-          dictionary BeforeInstallPromptEventInit : EventInit {
-            AppBannerPromptOutcome userChoice;
-          };
-
           dictionary PromptResponseObject {
             AppBannerPromptOutcome userChoice;
           };