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Pro Integrates with any CI tool
Selenium, with its ability to interact with different testing frameworks, like NUnit or xUnit, makes it easy to get Selenium working with practically any Continuous Integration services.
Pro Uses an approved WC3 standard - WebDriver
The WebDriver protocol is standardized by the World Wide Web Consortium which makes it easy for third-parties to get involved and contribute to Selenium.
WebDriver has been the foundation of many additional automation projects besides core selenium and has become the de-facto standard for UI automation.
Supports many browsers and a solid platform for adding future browsers to selenium (WebDriver)
Pro Actively supported
The open source community behind Selenium has a very large & engaged developer base. This ensures a stable support channel for the tool. In addition, various companies also provide support for Selenium. This active and multi-channel support provides a much more lucrative option for developers looking to implement Selenium in their workflow.
Pro You can use the same IDE you use for coding to debug
Pro Integrates well with existing testing frameworks
Pro Support for many languages
Selenium is based on Java and can be run on Windows, Mac, Linux, Unix, etc.
Pro Use the very minimum amount of code required to run
Selenium tries to inject into the page only the bare minimum of code needed to run the tests.
Pro Ability to imitate a real user using the application
Testing is analogous to a human being using the web application which is not possible with a solution which runs headless and claims to run faster than Selenium.
Pro Easy to set preconditions for the tests
Con The IDE for recording isn't too powerful
Con Issues with locators
Locators that support common attributes like: