fix(chromium): emit focus events in headful (#982)

Fixes #979

src/chromium/crPage.ts

@@ -99,6 +99,7 @@ export class CRPage implements PageDelegate {
       this._client.send('Runtime.enable', {}).then(() => this._ensureIsolatedWorld(UTILITY_WORLD_NAME)),
       this._networkManager.initialize(),
       this._client.send('Target.setAutoAttach', { autoAttach: true, waitForDebuggerOnStart: true, flatten: true }),
+      this._client.send('Emulation.setFocusEmulationEnabled', { enabled: true }),
     ];
     const options = this._page.context()._options;
     if (options.bypassCSP)

test/focus.spec.js

@@ -0,0 +1,57 @@
+/**
+ * Copyright Microsoft Corporation. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const utils = require('./utils');
+const { waitEvent } = utils;
+
+/**
+ * @type {PageTestSuite}
+ */
+module.exports.describe = function({testRunner, expect}) {
+  const {describe, xdescribe, fdescribe} = testRunner;
+  const {it, fit, xit, dit} = testRunner;
+  const {beforeAll, beforeEach, afterAll, afterEach} = testRunner;
+
+  describe('Page.focus', function() {
+    it('should work', async function({page, server}) {
+      await page.setContent(`<div id=d1 tabIndex=0></div>`);
+      expect(await page.evaluate(() => document.activeElement.nodeName)).toBe('BODY');
+      await page.focus('#d1');
+      expect(await page.evaluate(() => document.activeElement.id)).toBe('d1');
+    });
+    it('should emit focus event', async function({page, server}) {
+      await page.setContent(`<div id=d1 tabIndex=0></div>`);
+      let focused = false;
+      await page.exposeFunction('focusEvent', () => focused = true);
+      await page.evaluate(() => d1.addEventListener('focus', focusEvent));
+      await page.focus('#d1');
+      expect(focused).toBe(true);
+    });
+    it('should emit blur event', async function({page, server}) {
+      await page.setContent(`<div id=d1 tabIndex=0>DIV1</div><div id=d2 tabIndex=0>DIV2</div>`);
+      await page.focus('#d1');
+      let focused = false;
+      let blurred = false;
+      await page.exposeFunction('focusEvent', () => focused = true);
+      await page.exposeFunction('blurEvent', () => blurred = true);
+      await page.evaluate(() => d1.addEventListener('blur', blurEvent));
+      await page.evaluate(() => d2.addEventListener('focus', focusEvent));
+      await page.focus('#d2');
+      expect(focused).toBe(true);
+      expect(blurred).toBe(true);
+    });
+  });
+};

test/playwright.spec.js

@@ -173,6 +173,7 @@ module.exports.describe = ({testRunner, product, playwrightPath}) => {
       testRunner.loadTests(require('./emulation.spec.js'), testOptions);
       testRunner.loadTests(require('./evaluation.spec.js'), testOptions);
       testRunner.loadTests(require('./frame.spec.js'), testOptions);
+      testRunner.loadTests(require('./focus.spec.js'), testOptions);
       testRunner.loadTests(require('./input.spec.js'), testOptions);
       testRunner.loadTests(require('./jshandle.spec.js'), testOptions);
       testRunner.loadTests(require('./keyboard.spec.js'), testOptions);