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Get rid of the obsolete @nest spec (#3913)

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Natalie Weizenbaum 2024-08-13 16:44:09 -07:00 committed by GitHub
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spec/at-rules/nest.md
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# `@nest` Rule
Sass has special semantics for the `@nest` rule. Although this rule is primarily
intended to give the CSSOM a consistent representation for interleaved
declarations and is never required to be written explicitly, it *is* valid CSS
and Sass must ensure that its use preserves the existing CSS semantics.
## Syntax
<x><pre>
**NestRule** ::= '@nest'¹ '{' Statements '}'
</pre></x>
1: This is case-insensitive.
## Semantics
To execute a `@nest` rule `rule`:
* If there's a [current keyframe block], throw an error.
[current keyframe block]: ../style-rules.md#current-keyframe-block
* If there's a [current style rule], evaluate each child in `rule`'s
`Statement`s.
[current style rule]: ../style-rules.md#current-style-rule
* Otherwise, [evaluate `rule` as an unknown at-rule] with
`InterpolatedIdentifier` "nest", no `InterpolatedValue`, and the same
`Statements`.
[evaluate `rule` as an unknown at-rule]: ../at-rules/unknown.md