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How to use accessibilitySnapshot method in Playwright Internal

Best JavaScript code snippet using playwright-internal

wkAccessibility.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.getAccessibilityTree = getAccessibilityTree;6/**7 * Copyright (c) Microsoft Corporation.8 *9 * Licensed under the Apache License, Version 2.0 (the "License");10 * you may not use this file except in compliance with the License.11 * You may obtain a copy of the License at12 *13 * http://www.apache.org/licenses/LICENSE-2.014 *15 * Unless required by applicable law or agreed to in writing, software16 * distributed under the License is distributed on an "AS IS" BASIS,17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.18 * See the License for the specific language governing permissions and19 * limitations under the License.20 */21async function getAccessibilityTree(session, needle) {22  const objectId = needle ? needle._objectId : undefined;23  const {24    axNode25  } = await session.send('Page.accessibilitySnapshot', {26    objectId27  });28  const tree = new WKAXNode(axNode);29  return {30    tree,31    needle: needle ? tree._findNeedle() : null32  };33}34const WKRoleToARIARole = new Map(Object.entries({35  'TextField': 'textbox'36})); // WebKit localizes role descriptions on mac, but the english versions only add noise.37const WKUnhelpfulRoleDescriptions = new Map(Object.entries({38  'WebArea': 'HTML content',39  'Summary': 'summary',40  'DescriptionList': 'description list',41  'ImageMap': 'image map',42  'ListMarker': 'list marker',43  'Video': 'video playback',44  'Mark': 'highlighted',45  'contentinfo': 'content information',46  'Details': 'details',47  'DescriptionListDetail': 'description',48  'DescriptionListTerm': 'term',49  'alertdialog': 'web alert dialog',50  'dialog': 'web dialog',51  'status': 'application status',52  'tabpanel': 'tab panel',53  'application': 'web application'54}));55class WKAXNode {56  constructor(payload) {57    this._payload = void 0;58    this._children = void 0;59    this._payload = payload;60    this._children = [];61    for (const payload of this._payload.children || []) this._children.push(new WKAXNode(payload));62  }63  children() {64    return this._children;65  }66  _findNeedle() {67    if (this._payload.found) return this;68    for (const child of this._children) {69      const found = child._findNeedle();70      if (found) return found;71    }72    return null;73  }74  isControl() {75    switch (this._payload.role) {76      case 'button':77      case 'checkbox':78      case 'ColorWell':79      case 'combobox':80      case 'DisclosureTriangle':81      case 'listbox':82      case 'menu':83      case 'menubar':84      case 'menuitem':85      case 'menuitemcheckbox':86      case 'menuitemradio':87      case 'radio':88      case 'scrollbar':89      case 'searchbox':90      case 'slider':91      case 'spinbutton':92      case 'switch':93      case 'tab':94      case 'textbox':95      case 'TextField':96      case 'tree':97        return true;98      default:99        return false;100    }101  }102  _isTextControl() {103    switch (this._payload.role) {104      case 'combobox':105      case 'searchfield':106      case 'textbox':107      case 'TextField':108        return true;109    }110    return false;111  }112  _name() {113    if (this._payload.role === 'text') return this._payload.value || '';114    return this._payload.name || '';115  }116  isInteresting(insideControl) {117    const {118      role,119      focusable120    } = this._payload;121    const name = this._name();122    if (role === 'ScrollArea') return false;123    if (role === 'WebArea') return true;124    if (focusable || role === 'MenuListOption') return true; // If it's not focusable but has a control role, then it's interesting.125    if (this.isControl()) return true; // A non focusable child of a control is not interesting126    if (insideControl) return false;127    return this.isLeafNode() && !!name;128  }129  _hasRendundantTextChild() {130    if (this._children.length !== 1) return false;131    const child = this._children[0];132    return child._payload.role === 'text' && this._payload.name === child._payload.value;133  }134  isLeafNode() {135    if (!this._children.length) return true; // WebKit on Linux ignores everything inside text controls, normalize this behavior136    if (this._isTextControl()) return true; // WebKit for mac has text nodes inside heading, li, menuitem, a, and p nodes137    if (this._hasRendundantTextChild()) return true;138    return false;139  }140  serialize() {141    const node = {142      role: WKRoleToARIARole.get(this._payload.role) || this._payload.role,143      name: this._name()144    };145    if ('description' in this._payload && this._payload.description !== node.name) node.description = this._payload.description;146    if ('roledescription' in this._payload) {147      const roledescription = this._payload.roledescription;148      if (roledescription !== this._payload.role && WKUnhelpfulRoleDescriptions.get(this._payload.role) !== roledescription) node.roledescription = roledescription;149    }150    if ('value' in this._payload && this._payload.role !== 'text') {151      if (typeof this._payload.value === 'string') node.valueString = this._payload.value;else if (typeof this._payload.value === 'number') node.valueNumber = this._payload.value;152    }153    if ('checked' in this._payload) node.checked = this._payload.checked === 'true' ? 'checked' : this._payload.checked === 'false' ? 'unchecked' : 'mixed';154    if ('pressed' in this._payload) node.pressed = this._payload.pressed === 'true' ? 'pressed' : this._payload.pressed === 'false' ? 'released' : 'mixed';155    const userStringProperties = ['keyshortcuts', 'valuetext'];156    for (const userStringProperty of userStringProperties) {157      if (!(userStringProperty in this._payload)) continue;158      node[userStringProperty] = this._payload[userStringProperty];159    }160    const booleanProperties = ['disabled', 'expanded', 'focused', 'modal', 'multiline', 'multiselectable', 'readonly', 'required', 'selected'];161    for (const booleanProperty of booleanProperties) {162      // WebArea and ScorllArea treat focus differently than other nodes. They report whether their frame  has focus,163      // not whether focus is specifically on the root node.164      if (booleanProperty === 'focused' && (this._payload.role === 'WebArea' || this._payload.role === 'ScrollArea')) continue;165      const value = this._payload[booleanProperty];166      if (!value) continue;167      node[booleanProperty] = value;168    }169    const numericalProperties = ['level', 'valuemax', 'valuemin'];170    for (const numericalProperty of numericalProperties) {171      if (!(numericalProperty in this._payload)) continue;172      node[numericalProperty] = this._payload[numericalProperty];173    }174    const tokenProperties = ['autocomplete', 'haspopup', 'invalid'];175    for (const tokenProperty of tokenProperties) {176      const value = this._payload[tokenProperty];177      if (!value || value === 'false') continue;178      node[tokenProperty] = value;179    }180    const orientationIsApplicable = new Set(['ScrollArea', 'scrollbar', 'listbox', 'combobox', 'menu', 'tree', 'separator', 'slider', 'tablist', 'toolbar']);181    if (this._payload.orientation && orientationIsApplicable.has(this._payload.role)) node.orientation = this._payload.orientation;182    return node;183  }...

accessibility.js

Source: accessibility.js

...52    this._channel = channel53  }54  async snapshot(options = {}) {55    const root = options.root ? options.root._elementChannel : undefined56    const result = await this._channel.accessibilitySnapshot({57      interestingOnly: options.interestingOnly,58      root59    })60    return result.rootAXNode ? axNodeFromProtocol(result.rootAXNode) : null61  }62}...

Using AI Code Generation

1const {chromium} = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const snapshot = await page.accessibility.snapshot();7  console.log(snapshot);8  await browser.close();9})();10{11    {12        {13        },14        {15        },16        {17            {18            }19        }20    }21}

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const snapshot = await accessibilitySnapshot(page);8  console.log(snapshot);9  await browser.close();10})();11const { test, expect } = require('@playwright/test');12test('snapshot', async ({ page }) => {

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test');2const fs = require('fs');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const snapshot = await accessibilitySnapshot(page);8  fs.writeFileSync('snapshot.json', JSON.stringify(snapshot));9  await browser.close();10})();

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test/lib/server/chromium/crBrowser');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const snapshot = await accessibilitySnapshot(page);8  console.log(snapshot);9  await browser.close();10})();11{12    {13    },14    {

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4  const snapshot = await accessibilitySnapshot(page);5  expect(snapshot).toMatchSnapshot('playwright-homepage.snapshot');6});7{8    {9        {10        }11    },12    {13        {14        }15    },16    {17    },18    {19    },20    {21    },22    {23    },24    {25    },26    {27    },28    {29    },

Using AI Code Generation

1const { accessibilitySnapshot } = require('playwright/lib/server/chromium/crBrowser');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const snapshot = await accessibilitySnapshot(page);8  console.log(snapshot);9  await browser.close();10})();11{12    {13        {

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test/lib/server/trace/recorder/snapshotter');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4  const snapshot = await accessibilitySnapshot(page);5  expect(snapshot).toMatchSnapshot('accessibility.snapshot');6});7const { test, expect } = require('@playwright/test');8test('test', async ({ page }) => {9  const snapshot = await page.accessibility.snapshot();10  expect(snapshot).toMatchSnapshot('accessibility.snapshot');11});

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4  const snapshot = await accessibilitySnapshot(page);5  expect(snapshot).toMatchSnapshot('accessibility.snapshot');6});7Object {8    Object {9        Object {10        },11    },12}13`;14AccessibilitySnapshot {

Using AI Code Generation

1const playwright = require('playwright');2const fs = require('fs');3(async () => {4  const browser = await playwright.chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const snapshot = await page.accessibility.snapshot();8  fs.writeFileSync('snapshot.json', JSON.stringify(snapshot, null, 2));9  await browser.close();10})();11const playwright = require('playwright');12const fs = require('fs');13(async () => {14  const browser = await playwright.chromium.launch();15  const context = await browser.newContext();16  const page = await context.newPage();17  const snapshot = await page.accessibility.snapshot();18  fs.writeFileSync('snapshot.json', JSON.stringify(snapshot, null, 2));19  await browser.close();20})();21const playwright = require('playwright');22const fs = require('fs');23(async () => {24  const browser = await playwright.chromium.launch();25  const context = await browser.newContext();26  const page = await context.newPage();27  const snapshot = await page.accessibility.snapshot();28  fs.writeFileSync('snapshot.json', JSON.stringify(snapshot, null, 2));29  await browser.close();30})();31const playwright = require('playwright');32const fs = require('fs');33(async () => {34  const browser = await playwright.chromium.launch();35  const context = await browser.newContext();36  const page = await context.newPage();37  const snapshot = await page.accessibility.snapshot();38  fs.writeFileSync('snapshot.json', JSON.stringify(snapshot, null, 2));39  await browser.close();40})();

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test/lib/server/trace/recorder/snapshotter');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4  const snapshot = await accessibilitySnapshot(page);5  expect(snapshot).toMatchSnapshot('accessibility.snapshot');6});7const { test, expect } = require('@playwright/test');8test('test', async ({ page }) => {9  const snapshot = await page.accessibility.snapshot();10  expect(snapshot).toMatchSnapshot('accessibility.snapshot');11});

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test');2const { test, expect } = require('@playwright/test');3test('test', async ({ page }) => {4  const snapshot = await accessibilitySnapshot(page);5  expect(snapshot).toMatchSnapshot('accessibility.snapshot');6});7Object {8    Object {9        Object {10        },11    },12}13`;14AccessibilitySnapshot {

Using AI Code Generation

1const { accessibilitySnapshot } = require('@playwright/test/lib/server/trace/recorder/snapshotter');2const { getTestState } = require('@playwright/test/lib/server/trace/recorder/recorderProcess');3const { Accessibility } = require('@playwright/test/lib/server/trace/recorder/accessibility');4const { Page } = require('@playwright/test/lib/server/page');5const { Snapshotter } = require('@playwright/test/lib/server/snapshot/snapshotter');6const { SnapshotStorage } = require('@playwright/test/lib/server/snapshot/snapshotStorage');7const { SnapshotServer } = require('@playwright/test/lib/server/snapshot/snapshotServer');8(async () => {9    const page = await browser.newPage();10    const snapshotter = new Snapshotter(page, new SnapshotStorage(), new SnapshotServer());11    const accessibility = new Accessibility(page);12    const testState = getTestState();13    const context = page.context();14    const browser = context.browser();15    const browserContext = browser._browserContext;16    const snapshotServer = browserContext._snapshotter._snapshotServer;17    const snapshotStorage = browserContext._snapshotter._snapshotStorage;

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

Is it possible to get the selector from a locator object in playwright?

firefox browser does not start in playwright

How to run a list of test suites in a single file concurrently in jest?

firefox browser does not start in playwright

Jest + Playwright - Test callbacks of event-based DOM library

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

This question is quite close to a "need more focus" question. But let's try to give it some focus:

Does Playwright has access to the cPicker object on the page? Does it has access to the window object?

Yes, you can access both cPicker and the window object inside an evaluate call.

Should I trigger the events from the HTML file itself, and in the callbacks, print in the DOM the result, in some dummy-element, and then infer from that dummy element text that the callbacks fired?

Exactly, or you can assign values to a javascript variable:

const cPicker = new ColorPicker({
  onClickOutside(e){
  },
  onInput(color){
    window['color'] = color;
  },
  onChange(color){
    window['result'] = color;
  }
})

And then

it('Should call all callbacks with correct arguments', async() => {
    await page.goto(`http://localhost:5000/tests/visual/basic.html`, {waitUntil:'load'})

    // Wait until the next frame
    await page.evaluate(() => new Promise(requestAnimationFrame))

    // Act
   
    // Assert
    const result = await page.evaluate(() => window['color']);
    // Check the value
})

https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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