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Document clamp() as a special function (#513)

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Closes #505
See sass/sass#2860
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Natalie Weizenbaum 2020-12-29 17:02:30 -08:00 committed by GitHub
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source/documentation/syntax/special-functions.html.md.erb
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@ -84,13 +84,22 @@ calls][]—it's parsed as a normal [plain CSS function call][].
font-weight: 400
<% end %>
## `calc()`, `element()`, `progid:...()`, and `expression()`
## `calc()`, `clamp()`, `element()`, `progid:...()`, and `expression()`
The [`calc()`][] and [`element()`][] functions are defined in the CSS spec.
Because `calc()`'s mathematical expressions conflict with Sass's arithmetic, and
`element()`'s IDs could be parsed as colors, they need special parsing.
<% impl_status dart: "1.31.0", libsass: false, ruby: false, feature: "clamp()" do %>
LibSass, Ruby Sass, and older versions of Dart Sass treat `clamp()` as a
[plain CSS function] rather than supporting special syntax within it.
[plain CSS function]: ../at-rules/function#plain-css-functions
<% end %>
The [`calc()`], [`clamp()`] and [`element()`] functions are defined in the CSS
spec. Because `calc()`'s mathematical expressions conflict with Sass's
arithmetic, and `element()`'s IDs could be parsed as colors, they need special
parsing.
[`calc()`]: https://developer.mozilla.org/en-US/docs/Web/CSS/calc
[`clamp()`]: https://developer.mozilla.org/en-US/docs/Web/CSS/clamp
[`element()`]: https://developer.mozilla.org/en-US/docs/Web/CSS/element
[`expression()`][] and functions beginning with [`progid:`][] are legacy