Technical review: Document @supports at-rule() function

[chrisdavidmills]

Description

Chrome 148 adds support for the @supports at-rule() function. See https://chromestatus.com/feature/5110744177836032.

This PR adds documentation for the new function.

Motivation

Additional details

Related issues and pull requests

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web/CSS/Reference/At-rules/@supports

Flaws (15)

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Web/CSS/Reference/At-rules/@supports
Title: @supports CSS at-rule
Flaw count: 15

• macros:
  • Macro csssyntax produces link /en-US/docs/Web/CSS/Reference/Values/function-token which doesn't resolve
  • Macro csssyntax produces link /en-US/docs/Web/CSS/Reference/Values/any-value which doesn't resolve
  • Macro csssyntax produces link /en-US/docs/Web/CSS/Reference/Values/any-value which doesn't resolve
  • Macro csssyntax produces link /en-US/docs/Web/CSS/Reference/Values/at-keyword-token which doesn't resolve
  • Macro csssyntax produces link /en-US/docs/Web/CSS/Reference/Values/declaration which doesn't resolve
  • and 10 more flaws omitted

[kbabbitt]

at-rule() documentation lgtm.