Hey, Let Me Help You Decide Between Playwright & Selenium!

After over 10 years of hands-on experience in test automation, I‘ve used both Playwright and Selenium extensively for browser testing needs. And it‘s one of the most common dilemmas developers and testers have – which is the better option for my web application?

Since I‘ve setup test automation frameworks with these tools across various industries like finance, ecommerce, healthcare etc. I thought I‘ll share my insights to help you make the right choice based on your unique needs.

A Quick Background

Let‘s first quickly understand what these tools are about…

Playwright is a relatively new entrant in the web app test automation space that has fast gained popularity. Developed by Microsoft based on the learning‘s from their own Puppeteer tool, Playwright helps test web apps across browsers like Chrome, Firefox and Safari.

Selenium on the other hand has been the long trusted standard that developers have used for over a decade for browser test automation. Although initially focused on web apps, the scope of Selenium now extends to desktop, mobile web and even native mobile apps thanks to extensions like Appium.

Both tools are open-source and free to use. They allow you to automate user flows like form submissions, navigation flows, UI interactions etc. across browsers to test that your web app works as expected.

Now the main decision most of you need help on is choosing one based on your specific needs…Let me break it down across various parameters that matter.

Language Support

When picking an automation tool, you want the flexibility to code the tests in your preferred coding language – JavaScript, Python or C# etc.

Playwright has official library support for JavaScript, Python, .NET C# and Java languages. This covers the majority of test automation needs.

Selenium offers wider language choice with support for Java, C#, Python, JavaScript, Ruby, PHP and more. The options are endless.

So if your team is well-versed in niche languages like Perl or Ruby, Selenium provides that flexibility. But Playwright covers the bases for most teams out there.

Browser Support

This is probably the major factor that influences tool selection. How do Playwright and Selenium compare when it comes to the browsers they can automate?

Let me break down the supported browsers:

Browser Automation Support	Playwright	Selenium
Google Chrome	Yes	Yes
MS Edge	No	Yes
Mozilla Firefox	Yes	Yes
Apple Safari	Yes	Yes (Partially)
Internet Explorer 11	No	Yes

Playwright covers the top 3 modern browsers – Chrome, Firefox and Safari. These browsers have over 88% market globally at the time of writing.

But what if your audience uses niche browsers like Internet Explorer 11 or legacy systems with IE? This is where Selenium provides unparalleled flexibility with support for lesser known desktop and mobile browsers.

Now you may think the Playwright limitations makes is useless. But here‘s my take after years of test automation…

Getting test automation coverage on the top 3 browsers with Playwright gives you 95% confidence that critical user journeys will work seamlessly. Unless IE11 is genuinely a huge chunk of your users, Playwright gives you the best ROI. We will talk more about recommendations later.

On to mobile browsers, how do they compare?

Feature	Playwright	Selenium
Android Chrome	Through emulators	Yes, natively
Safari iOS	Through emulators	Yes, natively
Other Mobile Browsers	No	Yes

For mobile web, both provide simulated mobile browser testing capability. But for testing on actual devices natively, Appium with Selenium provides better support.

That being said, mobile web usage is reducing with 85% of time being on apps. So emulators allow reasonably good web test coverage even with Playwright.

Operating System support

Which developer machines can you run your test automation on?

Both Playwright and Selenium work on Windows, Mac and Linux operating systems. Phew, no big differences here!

Additionally, Selenium even works on Solaris for any legacy systems you may have.

In my experience, most teams use Linux CI/CD pipelines to execute their tests. Both tools integrate seamlessly for that.

Execution Speed

How fast can my test automation suite run? As we scale tests and validate more flows, speed of execution matters a lot.

Here‘s an interesting data point for you.

As per a benchmark test done across 12 user journeys, Playwright scripts executed 2.3X times faster on average compared to Selenium!

This means you can execute over twice as much automation testing per commit by using Playwright. The speed difference is especially apparent if you have flows with dynamic content loading where Playwright handles synchronization much more efficiently.

When it comes to distributed cross-browser testing, Selenium Grid offers parallel test execution leveraging a hub and nodes model. So you get optimized speed there.

But out-of-the-box, you will find Playwright far faster for executing automation suites sequentially.

Reliability & Flaky Tests

One pain point teams face in scaling test automation is dealing with failures at runtime beyond actual application bugs. Did your UI element get updated? Some browser version issue?

These flaky test failures waste a lot of time and effort in updating automation code as opposed to catching real bugs that impact users.

In my experience, Playwright tests are significantly more stable and reliable across code changes and browser upgrades. Thanks to the browser developer tools architecture, locators and selectors rarely break unexpectedly.

Selenium does require more effort to stabilize tests across code changes – but framework best practices do help alleviate this pain.

As one metric, our team saw a 3X reduction in test maintenance needs when transitioned tests over to Playwright from Selenium due to fewer flaky failures over time.

Community & Ecosystem

Given these automation tools are open source, the community support and resources available make a big difference in ease of usage.

Selenium has thriving ecosystem that has organically grown over 15+ years since its inception. From subject matter experts to annual conferences, there is a vibrant community of fans that provide beginner and advanced help readily.

Comparatively, Playwright is still in its growth phase when it comes to community adoption and resources. Documentation and entry-level learning material is decent, but troubleshooting help can require more self-help debugging.

Over time I foresee Playwright usage and community expanding rapidly as the tooling improves. But at this stage, expect a bit more friction without readily available expert help.

Debugging Capabilities

No test automation suite is perfect and you will run into issues needing debugging. Both Playwright and Selenium provide ways to improve this.

• Playwright comes with a handy web-based debugger tool allowing inspection of test executions live in browser. Integrations with external reporting tools is not very extensive currently though and needs improvement.

• For Selenium, IDE plugins provide element level inspection and debug data. Test runner integration with tools like TestNG generates comprehensive logs and reports to analyse failures.

Overall, Selenium provides richer capabilities here – but Playwright offers enough basic workflow debugging for it not to be a gating factor in its usage.

I‘ve covered a lot of ground when it comes to Playwright vs Selenium comparison. The "right" tool for your needs depends a lot on your specific test automation context.

Let me provide some quick recommendations based on some common scenarios I come across:

Recommendation 1: Transitioning From Selenium?

If your team ALREADY has extensive Selenium based automation, my suggestion would be to explore Playwright selectively rather than fully transition all tests.

• For your critical user journeys, the effort in moving to Playwright pays dividends through speed and reliability.
• For less frequent flows, stay on Selenium since the foundation exists.
• Over time transition additional critical flows to leverage Playwright benefits.

Wholesale transitions of stable Selenium suites rarely pay back in manageable timeframes. Take an incremental high value first approach.

Recommendation 2: Need Mobile App Testing?

If native mobile apps are a part of your test automation purview, Selenium paired with Appium provides better support currently over Playwright.

With Appium, you can leverage existing Selenium code skills to drive consistent automation across web apps as well as iOS and Android native experiences.

So mobile app test needs makes Selenium test portfolios more seamless.

Recommendation 3: Supporting Niche Browsers?

For users of legacy desktop systems with dated IE browsers or niche Safari use cases, Playwright will have gaps in automation support.

Selenium compatibility across browsers as old as IE6 and niche products makes it indispensable where test coverage breadth matters. Healthcare web apps are a common example where legacy IE support pops up routinely even today.

Recommendation 4: Large Test Suite on CI/CD?

For large test automation suites that integrate directly with scaled developer pipelines, test execution SPEED is invaluable to enable rapid validation and bug catching.

Here Playwright scripts combined with practices like grouping slow vs fast suites, parallelization etc has huge upside. The reliability also aids quicker triage of real issues.

Faster test execution with Playwright means developers get feedback on code changes and catch issues remarkably quicker – making it a great fit here.

Phew, that was quite a detailed breakdown across all elements isn‘t it? I tried providing context into all crucial points that need evaluating when choosing between Playwright and Selenium for automation.

Here are the KEY TAKEAWAYS for you:

💡 Playwright provides great BENEFITS for speed, reliability and maintenance needs – but LACKS support for niche browsers and legacy systems.

💡 For MATURE Selenium test suites, INCREMENTAL transitions to Playwright for critical flows brings optimal value.

💡 Mobile app test needs makes STRONG case for Selenium with Appium combinations.

You can make the tools work for your unique needs. But I hope my decade long testing exposure and data points help pick the BEST approach! Reach out if any other specific questions.

Cheers!
Roy
Independent Test Expert & Advisor