Cross browser testing is a practice to test a website or web-app across different browsers, devices and operating systems. To experience automation testing through an open-source platform is always blissful, especially when we refer to the practice of cross browser testing where test cases are found in plethora.
If you are not aware of Selenium, it is one of the most renowned open-source, test automation framework developed by Thoughtworks to facilitate automated cross browser testing with ease.
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Tools for running automation: