As you must be aware that in 1990s when IE and Netscape were competing to be the dominant browser, during that time all the browser company were engage in a race to be the top in the market. At that time it was very much difficult to develop a compatible website. However we are not facing such issues now. But Cross Browser Compatibility is needed to check the proper functioning of your website as per your requirement across all browsers and OS. Cross browser compatible websites run flawlessly across all browsers and OS combinations where gives a good reputation for your website or web apps.
Platforms like LambdaTest provides you access to over 1400+ browsers and OS combinations where you can perform Cross-Browser Testing of your website or web applications.