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Answer 
JavaScript automation in Selenium refers to using JavaScript (or Node.js) to write scripts for automating web browsers via Selenium WebDriver. Popular frameworks like WebDriverIO or Nightwatch.js allow you to interact with web pages, simulate user actions, and validate results using JavaScript.
Efficiency compared to Java:
Java: Java has better integration with Selenium WebDriver, robust tooling, and performance for complex scenarios. It’s widely used in large-scale enterprise testing.
JavaScript: JavaScript is faster to set up and run for simpler or modern web automation. It's more suitable for front-end testing or when working with Node.js applications.
In terms of efficiency, both languages are effective, but Java might handle larger-scale, enterprise-level testing better, while JavaScript is often preferred for quick, lightweight automation or front-end
testing.
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