extend platform expressions to support media query syntax - terminals… #21444
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Update documentation to support media queries syntax in platform expressions.
In media queries syntax (Media Queries):
This change extends platform expressions by using the same list-separator model for "," and by adding the other terminals ("and", "not") as synonyms for the corresponding operators that are already supported ("&", "!"). This change also adds "or" as a synonym for "|" as a potential future extension.
Open question: does the EBNF need to disambiguate "and", "not", "or" as keywords and not identifiers?