3. Why Companies Choose Playwright Over Alternatives

Two distinct claims worth separating.

Speed: Playwright communicates with the browser directly over CDP/WebSocket (see Part 1, Chapter 3), which is a lower-overhead path than Selenium’s WebDriver protocol, which adds an extra HTTP layer (the WebDriver server) between your test code and the browser.

Reliability: this comes almost entirely from auto-waiting. A Selenium suite without carefully hand-tuned explicit waits will produce intermittent failures that have nothing to do with real bugs — just timing. Teams that migrate to Playwright commonly report their flaky-test rate dropping substantially, simply because the waiting problem is handled by the framework instead of by every individual test author remembering to do it right.

• Speed → protocol path (CDP/WebSocket vs WebDriver HTTP)
• Reliability → auto-waiting owned by the framework

Selenium and older Puppeteer-era approaches were designed before SPAs (React/Angular/Vue apps that don’t do full page reloads) and shadow DOM (encapsulated web components) were the norm. Playwright’s locator engine was built with these patterns in mind — it can pierce shadow DOM by default and has first-class frame_locator() support for iframes (Part 2, Chapter 9), rather than requiring the workarounds these patterns demanded in older tools.

Restating this because it’s genuinely the recurring theme across the entire manual — it comes up again in Chapters 5, 7, and 8. If there’s one concept to have rock-solid before moving past Part 2, it’s this one.

Playwright adoption has grown fast over the last few years, and job postings mentioning it (versus Selenium-only postings) have been trending upward. This isn’t just a “nice tool” — it’s increasingly what QA automation job descriptions actually ask for, which is part of why this manual exists in your learning path.