When you use these APIs for communication or data exchange on your servers, many times you might face certain problems like API not working, redirecting to some error page, link broken, etc. These problems call for understanding the need of API browser compatibility.
API browser compatibility refers to the support of different browser for different APIs. With every upgrade in a browser there are various deprecations that occur simultaneously. These deprecations append the support of various tags, codes, and technologies so it becomes necessary to stay up-to date with them.
So, many times these upgrades and deprecations break the API connections and you might not be able to send an API request or get a callback. Therefore you need to test and API.