Atlas › 13 Browser Automation with Playwright › Parallel Execution and Reporting☰ Read as one page
Parallel Execution and Reporting
14.1OverviewFast feedback is the difference between tests that developers run and tests they skip. Playwright's built-in parallelism, sharding, and CI…14.2Parallel ExecutionPlaywright runs tests in parallel by default using worker processes. Each worker gets its own browser instance with isolated contexts.14.3Sharding Across CI MachinesFor large suites, split execution across multiple CI machines:14.4CI/CD IntegrationPlaywright provides official Docker images with all browsers pre-installed:14.5Trace ViewerPlaywright's Trace Viewer is the most powerful debugging tool for CI failures. It records a complete timeline of every action, network…14.6HTML ReportWhen sharding across machines, merge the individual reports:14.7Test Retry Strategy1. Check Trace Viewer for timing issues 2. Look for missing await statements 3. Check for shared state between tests 4. Look for dependency…14.8Key Takeaways- Playwright parallelizes tests across worker processes — no external grid infrastructure needed - Shard across CI machines for linear…