How to test websites in browsers and operating systems?

How to test websites in browsers and operating systems ?
Now I'm sitting on 7-ke the windows and just everything is tested.
Downloaded all popular browsers and what they support, and whether these sites for testing in windows XP, Vista, linux ?
How safari support ?

Otpishite please how to test the sites with any web designer for cross-platform/cross-browser layout.
June 14th 19 at 18:28
1 answer
June 14th 19 at 18:30
For testing OSes is irrelevant. Only the browser and its version.

PS: I was wrong. It is clear that the design of the OS will be different due to fonts, components, therefore, believed that the OS should only bother the designers. Always had a thing with the page functionality. But the fact that in IE with the same version, but different OS can run blocks, was news to me. This is serious design. Now it is necessary to record not only the list of browsers and OS for a specific version.
if, for example, interested in Safari, you operating system is very important. - kavon.Murphy commented on June 14th 19 at 18:33
so I mean it's still ie 11 on windows 10 below Ki is not =( - keara.Gibs commented on June 14th 19 at 18:36

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