How do you run tests across different devices or viewports in Playwright?

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To run tests across different devices or viewports in Playwright, you can use the built-in device emulation and viewport configuration features. Playwright provides a set of predefined devices (like iPhone, Pixel, iPad) via playwright.devices, and you can also set custom viewports manually.

1. Using Predefined Devices

Playwright includes many preset device descriptors for mobile and tablet emulation.

2. Using Custom Viewport Sizes

You can manually set the viewport dimensions to test responsiveness on various screen sizes.

3. Playwright Test Configuration (for Automation)

In playwright.config.js, define multiple projects for different devices:

Summary:
Playwright supports testing across devices using device emulation and custom viewports, both programmatically and through config files. This helps ensure your app is responsive and works well on various screen sizes and platforms.

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