Set withEnvironment of event handler scopes correctly

Tests: web-platform-tests/wpt#26091.

Fixes #6079.

source

@@ -92304,15 +92304,15 @@ typedef <span>OnBeforeUnloadEventHandlerNonNull</span>? <dfn>OnBeforeUnloadEvent
         </dl>
        </dd>
 
-       <dt><var>Body</var></dt>
+       <dt><var>body</var></dt>
 
        <dd>The result of parsing <var>body</var> above.</dd>
 
        <dt><var>thisMode</var></dt>
 
        <dd>non-lexical-this</dd>
 
-       <dt><var>Scope</var></dt>
+       <dt><var>scope</var></dt>
 
        <dd>
         <ol>
@@ -92324,19 +92324,19 @@ typedef <span>OnBeforeUnloadEventHandlerNonNull</span>? <dfn>OnBeforeUnloadEvent
          <li>
           <p>If <var>eventHandler</var> is an element's <span data-x="event handlers">event
           handler</span>, then set <var>scope</var> to <span
-          data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>document</var>,
+          data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>document</var>, true,
           <var>scope</var>).</p>
 
           <p>(Otherwise, <var>eventHandler</var> is a <code>Window</code> object's <span
           data-x="event handlers">event handler</span>.)</p>
          </li>
 
          <li><p>If <var>form owner</var> is not null, then set <var>scope</var> to <span
-         data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>form owner</var>,
+         data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>form owner</var>, true,
          <var>scope</var>).</p></li>
 
          <li><p>If <var>element</var> is not null, then set <var>scope</var> to <span
-         data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>element</var>,
+         data-x="js-NewObjectEnvironment">NewObjectEnvironment</span>(<var>element</var>, true,
          <var>scope</var>).</p></li>
 
          <li><p>Return <var>scope</var>.</p></li>