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Meh... all meaningless, frankly.
Tests are easily rigged to suit whatever browser/OS/hardware combination the author has a preference for. Unless you have access to the test source code in the backend, the author could do something as trivial as look for the browser/OS in the HTML returned by the browser, and rig the results from there, and gullible users like you would simply never know.
There are examples where Safari on my MacBook Air vintage 2015 will toast all PC's - including hot gaming PC's - running the same test.
Conversely plenty of examples that show Chrome or Firefox will toast others, depending on the specific test and the platform used.
About the only constant is that MSIE is easily beaten by anything else on any platform that can run it.
And FWIW like Stefan, it won't run here in Safari on both of my macs. Apple is pretty good at compliance with standards including HTML5 so I'll suggest the test code is dodgy, at best.
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