How prepared are the browsers for HTML6 & CSS4?

Question

I found a site that test a browser for HTML6 support.

http://html6test.com

My crome scored:YOUR BROWSER Scores 516 OUT OF 555 POINTS

The HTML6 test score is an indication of how well your browser supports the HTML6 standard and related specifications. Find out which parts of HTML6 are supported by your browser today and compare the results with other browsers.

The HTML6 test does not try to test all of the new features offered by HTML6, nor does it try to test the functionality of each feature it does

Answer 1

It's not actually a valid html6 test but just html5 test with the domain name html6.
the latest candidate recommendation was 5.2 this year html6 is a long way next year or later...
https://www.w3.org/TR/html52/
HTML 5.2 - World Wide Web Consortium

Answer 2

@Lord Krishna, thanks for pointing that out.