nest: wrap a complex parent in :is() when substituting Â
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Match the ASCII convention for new prose; the section reference read "sec. 2" instead of the section-sign glyph.
CSS Nesting 1 makes & equivalent to :is() of the parent selector list. Substituting a parent that carries a combinator verbatim lets its own structure escape, so .dark & over .a .b flattened to .dark .a .b, which also requires .a to sit inside .dark.
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CSS Nesting 1 (sec. 2.1) makes
&equivalent to:is()of the parent selector list. Cascade substituted the parent verbatim, so flattening.a .b { .dark & { ... } }produced.dark .a .b, which additionally requires.ato sit inside.darkand so matches a different set of elements than.dark :is(.a .b).The wrapper is added only where it changes meaning: a parent with no combinator, or a
&heading the selector, still goes in verbatim.