[whatwg] [CSSWG][selectors-4] Updated WD of Selectors Level 4

[fantasai]

The CSS WG has published an updated Working Draft of Selectors Level 4

     https://www.w3.org/TR/selectors-4/

Selectors is a pattern-matching syntax for identifying sets of elements
in a document, and is used e.g. for applying CSS declarations to elements
in a document tree.

This publication brings the /TR draft up-to-date with all of the WG
resolutions since 2013. Significant changes are summarized at:
   https://www.w3.org/TR/2018/WD-selectors-4-20180201/#changes

This specification is now in the Refining stage: we don't expect any large
changes prior to CR, but will be continuing to address issues. Most features
are well-scoped, with significant open issues described in the draft to
solicit directed feedback.

One major focus of the next round of edits will be to update and improve
cross-references between Selectors and other Web standards (in coordination
with the editors of the DOM and HTML standards at WHATWG). If any of you
know of other specifications with incoming references to Selectors, please
let us know so that we can accommodate them, too!

In the meantime, please review the draft. You can send any comments to the
www-style list <www-style at w3.org>, prefixed with [selectors-4] (as I did on
this message) or (preferably) file them in the CSSWG GitHub repository at
   https://github.com/w3c/csswg-drafts/issues
We're hoping to address the remaining issues and issue a CR in the upcoming
months (but likely not before April).

Follow-ups to www-style.

For the CSS WG,
~fantasai