Testing / Playwright Interview questions

What is the difference between headless and headed mode?

These control whether the automated browser actually renders a visible window while a test runs.

Headless	Headed
No visible browser UI	Full visible browser window
Generally faster, lower resource use	Slightly slower, more resource use
Default for CI pipelines	Common for local debugging

Playwright runs headless by default. Switching to headed mode is done by passing an option at launch, or the --headed flag with the test runner:

npx playwright test --headed

Headed mode is mainly a debugging aid - watching the actual interactions can quickly reveal issues (like an unexpected popup or animation) that logs alone don't make obvious, but it's rarely used for actual CI execution because it adds overhead without adding coverage.

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Playwright's default execution mode is: Headed

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Headless

✓ Correct! Well done.

There is no default - it must always be specified

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Headed mode is mainly useful for: Faster CI runs

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Visually debugging a test locally

✓ Correct! Well done.

Reducing memory usage

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