How can you use Playwright to simulate mobile devices or test mobile responsiveness?

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Playwright makes it easy to simulate mobile devices and test mobile responsiveness using built-in device emulation and viewport configuration. Here’s how you can do it:

📱 1. Use Built-in Device Descriptors

Playwright includes predefined devices (e.g., iPhone 12, Pixel 5) that simulate screen size, user agent, and touch support.

• This emulates the device's resolution, touch behavior, and user agent.

🖥️ 2. Custom Viewport and User Agent

You can manually define viewport size, user agent, and other options.

🔄 3. Responsive Testing

To test how layouts respond across devices:

• Loop through multiple viewport sizes or device descriptors.

• Take screenshots or assert layout changes.

📸 4. Visual Regression Testing

Combine with screenshots to validate UI appearance across devices.

✅ Best Practices

• Use webkit for better accuracy on iOS emulation.

• Test both touch interactions and viewport-specific layouts.

• Automate across multiple devices for coverage.

Playwright’s device emulation gives reliable, fast, and scriptable mobile responsiveness testing, ideal for modern web apps.

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