Add scaffold for upcoming CSS features of 2023

Web/CSS/Upcoming 2023.md

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+---
+title: Upcoming CSS features in 2023
+published: false
+description: "A short explanation of the upcoming CSS features I'm the most
+excited about in early 2023, and why I can't wait for them to be official."
+tags: css,scope,components,vanilla
+date: 2023-02-27
+---
+
+## CSS Scoping
+
+> The `@scope` block at-rule allows authors to scope style rules in CSS, with
+> the application of weak scoping proximity between the scoping root and the
+> subject of each style rule.
+>
+> <cite>CSS Cascading and Inheritance Level 6 (W3C First Public Working Draft, 21 December 2021)</cite>
+
+## Relative Colors
+
+> Within a relative color syntax `color()` function using <custom-params>, the
+> number and name of the allowed channel keywords are:
+> 
+> <cite>CSS Color Module Level 5 (W3C Working Draft, 28 June 2022)</cite>
+
+## Contrast-Color
+
+> The `contrast-color()` functional notation identifies a sufficiently
+> contrasting color against a specified background or foreground color without
+> requiring manual computation.
+>
+> <cite>CSS Color Module Level 6 (Editor’s Draft, 15 February 2023)</cite>
+
+## CSS Nesting
+
+> Style rules can be nested inside of other styles rules. These nested style
+> rules act exactly like ordinary style rules—associating properties with
+> elements via selectors—but they "inherit" their parent rule’s selector
+> context, allowing them to further build on the parent’s selector without
+> having to repeat it, possibly multiple times.
+>
+> <cite>CSS Nesting Module (W3C Working Draft, 14 February 2023)</cite>