[1] [CITE@en['''['''selectors-4''']''' Add :is(), resolves #1170]]
([[LeaVerou]]著, [TIME[2017-12-02 06:06:13 +09:00]])
<https://github.com/w3c/csswg-drafts/commit/5948b1ce37463aa7f87fede040fac9dd2c233329>

[2] [CITE@en['''['''selectors''']''' Functional pseudo-class like :matches() with 0 specificity · Issue #1170 · w3c/csswg-drafts]]
([TIME[2017-12-05 17:47:57 +09:00]])
<https://github.com/w3c/csswg-drafts/issues/1170>

[3] [CITE@en['''['''selectors-4''']''' Add :is() example in specificity section, and add it in…]]
([[LeaVerou]]著, [TIME[2017-12-02 06:12:09 +09:00]])
<https://github.com/w3c/csswg-drafts/commit/a9fddaf185d9885bd657cd222956bccc35486939>