docs: add WebdriverIO to framework comparison section (#2894)

docs/guide/comparisons.md

@@ -14,7 +14,7 @@ title: Comparisons with Other Test Runners | Guide
 
 Cypress is known as an end-to-end testing tool, however their [new component test runner](https://on.cypress.io/component) has great support for testing Vite components and is an ideal choice to test anything that renders in a browser.
 
-Browser-based runners, like Cypress and Web Test Runner, will catch issues that Vitest cannot because they use the real browser and real browser APIs.
+Browser-based runners, like Cypress, WebdriverIO and Web Test Runner, will catch issues that Vitest cannot because they use the real browser and real browser APIs.
 
 Cypress's test driver is focused on determining if elements are visible, accessible, and interactive. Cypress is purpose-built for UI development and testing and its DX is centered around test driving your visual components. You see your component rendered alongside the test reporter. Once the test is complete, the component remains interactive and you can debug any failures that occur using your browser devtools.
 
@@ -26,6 +26,12 @@ Cypress has also been [integrating Vite in their products](https://www.youtube.c
 
 We believe that Cypress isn't a good option for unit testing headless code, but that using Cypress (for E2E and Component Testing) and Vitest (for unit tests) would cover your app's testing needs.
 
+## WebdriverIO
+
+[WebdriverIO](https://webdriver.io/) is similar to Cypress a browser based alternative test runner and a complementary tool to Vitest. It can be used as end-to-end testing tool as well as for testing [web components](https://webdriver.io/docs/component-testing). It even uses components of Vitest under the hood, e.g. for [mocking and stubing](https://webdriver.io/docs/component-testing/mocks-and-spies) within component tests.
+
+WebdriverIO comes with the same advantages as Cypress allowing you to test your logic in real browser. However it uses actual [web standards](https://w3c.github.io/webdriver/) for automation which overcomes some of the tradeoffs and limitation when running tests in Cypress. Furthermore it allows you to run tests on mobile as well, giving you access to test your application in even more environments.
+
 ## Web Test Runner
 
 [@web/test-runner](https://modern-web.dev/docs/test-runner/overview/) runs tests inside a headless browser, providing the same execution environment as your web application without the need for mocking out browser APIs or the DOM. This also makes it possible to debug inside a real browser using the devtools, although there is no UI shown for stepping through the test, as there is in Cypress tests. There is a watch mode, but it is not as intelligent as that of vitest, and may not always re-run the tests you want. To use @web/test-runner with a vite project, use [@remcovaes/web-test-runner-vite-plugin](https://github.com/remcovaes/web-test-runner-vite-plugin). @web/test-runner does not include assertion or mocking libraries, so it is up to you to add them.