What is the difference between page.waitForSelector() and page.waitForTimeout()?

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In Playwright or Puppeteer, both page.waitForSelector() and page.waitForTimeout() are used to pause script execution, but they serve different purposes and behave differently.

page.waitForSelector():

This method waits for a specific DOM element to appear, be visible, or meet a given condition (like being attached or detached from the DOM). It’s useful when you want to wait for an element to load before interacting with it.

  • Use case: Wait for a login button or a dynamic element to appear before clicking.

  • Syntax:

  • Custom options: You can specify visibility ({ visible: true }) or timeout duration.

page.waitForTimeout():

This method simply pauses the script for a fixed amount of time, regardless of the page state. It’s essentially a sleep or delay.

  • Use case: Temporary workaround when you can’t rely on element selectors or just need to delay.

  • Syntax:

Conclusion: Use page.waitForSelector() for dynamic page content and UI synchronization. Use page.waitForTimeout() only when absolutely necessary.

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