add support for :scope
as a pseudo-class for querySelector[All] / matches / closest
#578
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:scope
is a super useful tool in modern web dev, and it's hard to live without it once you're used to using it. This PR adds support for:scope
in its most useful context: used as a scope limiter in Element-based selector functions.This PR only covers the code-side use of :scope; :scope in an RCSS file will do nothing. I don't believe it's useful at all in RCSS without support for
@scope
or:root
, so I didn't bother with those.All of the use-cases here should apply & work: https://developer.mozilla.org/en-US/docs/Web/CSS/:scope#using_scope_in_javascript