This is years of progress for Google Chrome

[ScreenSavers]

Original MacBook Air on Snow Leopard vs 2018 MacBook Pro with Catalina.

Crazy thing is my MacBook with Mavericks gets 520!

 

[smbu2000]

Well it is mainly testing the browsers, so the computer shouldn't really matter too much if they are on the same version.
I did a quick test with the 3 browsers on my 2018 15" MBP and I scored:
Safari: 489
Firefox: 513
Opera: 535

 

[ScreenSavers]

I know it has little to do with the OS. But weird as it’s Chrome 49 vs 78 in my case.

 

[frou]

HTML5test is a bit mickey mouse

People doing web development look at specifics on Can-I-Use.

e.g. Chrome 49 vs 78:

Can I use... Support tables for HTML5, CSS3, etc

caniuse.com