“Website browser compatibility” is how well your website displays across various web browsing platforms: Firefox, Chrome, Internet Explorer, Safari, and so on. It also includes different operating systems: Windows 7, 8, 10, Mac OS X Mountain Lion, Mavericks, Yosemite, Android, etc.
You might think website browser compatibility should be 100%.
This sounds like a normal enough expectation for a website, right? A visitor should be able to see your website the same way no matter what device and browser he or she is using. Unfortunately, this isn’t a realistic expectation. Each browser interprets code differently. Even different versions of the same browser don’t interpret code the same way, and the same browser, same version may show a site differently depending on the operating system being used. So your website might look perfect in Firefox, but not appear exactly the same in Chrome. Or your site that looks beautiful in Internet Explorer 11 could be much less aesthetically pleasing in Internet Explorer 7. Chrome on a PC might display your site differently than Chrome on a Mac. The variations are endless.