When a web designer creates a website that is perfectly suited to their default web browser, they must be careful not to blindly assume that the site will display its contents, aesthetics, and scripts just as flawlessly on all other possible platforms that are in common use. In addition to the different programming code that makes up browsers like Firefox, Internet Explorer, Safari, and Google Chrome, the very operating system running a given browser can potentially affect whether some aspects of a web page's technical design will work as well as the rest. Meanwhile, websites obviously have to take the smaller sizes, dimensions, and available processing power of mobile devices into account when they are being designed.
A web designer can optimize the technical functionality of their current project for different types of browsers by regularly using the most prolific browsers on both their home computers and their mobile devices, but this only goes so far in making sure that websites work on any and all possible devices and programs. To save time and be able to concisely test whether a website will work across hundreds of different programs, versions of programs, and platforms, many designers sign up for BrowserStack, which offers a testing environment that is based on cloud computing. BrowserStack's services can not only let designers test their web designs on many digital environments at a time but also automate these tests for the designers' convenience. However, the full scope of BrowserStack's service suite lies behind a fairly expensive monthly subscription, and the free segments of its services are limited to a very temporary trial period.
Alternatively, users can carry out cross-browser tests for their work-in-progress site designs for free by using options included in the Microsoft Edge browser. For designers who do not have the luxury of money, they can use VirtualBox to emulate different types of operating systems within the bounds of their own computers and test their website designs on browsers installed within those virtual environments. VirtualBox makes it possible to have a computer run any of multiple "guest" operating systems at a time. For more information click here https://www.reddit.com/r/web_design/comments/8th1l4/which_utility_do_you_use_to_test_crossbrowser/.