Google has updated its URL structure best practices help documentation - it was pretty much a rewrite but the overall guidance is not new. Google said they added "clearer flow and is easier to ...
Google has updated its URL structure guidelines to specify what characters Google Search supports in URLs. The introduction paragraph now leads off by saying, "Google supports URLs as defined by RFC ...
Google updates Search documentation with standardized URL parameter guidelines, recommending "=" and "&" for optimal website crawling. Google recommends using "=" and "&" for URL parameters.