All About User Testing for Websites

What is User Testing?

What is it?
There is no better way to know how a website performs with its userbase other than directly see how a user browses your website. This is where User Testing comes in, a research technique where website creators view how participants use their website. You can directly observe what a real world user interacts with and how they do it. The point is to see how users would interact with your website without having true users interact with your website in case of any bad user experience.
Why use it?
User Testing can spot potential issues that may only ever come up on the user's end. As a developer, there is only so much you can figure out without data to go off of. With User Testing, you get this data. This can give developers great insight to how users will actually experience your website, for the better or worse. You take what you learned from User Testing and figure out a way to improve your website.

How is User Testing Done Across Browsers?

How to do it?
To start testing different browsers, you need different browsers. Start with the more popular browsers to test as they will have the largest percentage of users. It's not just different browsers, but different versions of browsers as well. Once you have your browsers, it's time to test. After getting results, see any errors that came up. Fix those errors, and maybe test it some more times. A seamless user experience is key, no user wants a bad experience.
Why do it?
It's almost a gurantee that there will be at least two users with different browsers and devices that go on your website. A good website must function good on most if not all browsers. Different browsers come with different features and different devices come with different performance. Some older browsers support less JavaScript and CSS compared to modern ones. A website that only works properly on one browser will cut out every user that doesn't use the specific browser, which is terrible.
Sources
Source 1: Usertesting
Source 2: Mozilla