fix: [webview] fix missing properties on events when contextIsolation: true (#26289)

spec-main/webview-spec.ts

@@ -650,4 +650,27 @@ describe('<webview> tag', function () {
     generateSpecs('without sandbox', false);
     generateSpecs('with sandbox', true);
   });
+
+  describe('DOM events', () => {
+    afterEach(closeAllWindows);
+    it('receives extra properties on DOM events when contextIsolation is enabled', async () => {
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          webviewTag: true,
+          contextIsolation: true
+        }
+      });
+      await w.loadURL('about:blank');
+      const message = await w.webContents.executeJavaScript(`new Promise((resolve, reject) => {
+        const webview = new WebView()
+        webview.setAttribute('src', 'data:text/html,<script>console.log("hi")</script>')
+        webview.addEventListener('console-message', (e) => {
+          resolve(e.message)
+        })
+        document.body.appendChild(webview)
+      })`);
+      expect(message).to.equal('hi');
+    });
+  });
 });