PR was elaborated with how many backlink you have... more backlinks is better on SERP, better for keywords and very sticky to people find the site on the SE,.
Does it really matter now that Google has dropped Page Rank? You might want to read this article here.
Last time I checked http://jigsaw.w3.org/css-validator/ and http://www.gov.cn both were PR10 plus there are many PR8-9 .cn domains out there
Did you even read this thread before posting? Did you not see the other sites that are listed with PR10. Google is NOT the only one. Why did you post this nonsense for?