[page type] Add page-type for CSS at-rules and at-rule descriptors

[wbamberg]

This PR adds page-type values for CSS at-rules and at-rule descriptors, following the analysis in #15540.

[github-actions]

Preview URLs (43 pages)

• /en-US/docs/Web/CSS/@charset
• /en-US/docs/Web/CSS/@color-profile
• /en-US/docs/Web/CSS/@counter-style/additive-symbols
• /en-US/docs/Web/CSS/@counter-style/fallback
• /en-US/docs/Web/CSS/@counter-style/negative
• /en-US/docs/Web/CSS/@counter-style/pad
• /en-US/docs/Web/CSS/@counter-style/prefix
• /en-US/docs/Web/CSS/@counter-style/range
• /en-US/docs/Web/CSS/@counter-style/speak-as
• /en-US/docs/Web/CSS/@counter-style/suffix
• /en-US/docs/Web/CSS/@counter-style/symbols
• /en-US/docs/Web/CSS/@counter-style/system
• /en-US/docs/Web/CSS/@counter-style
• /en-US/docs/Web/CSS/@document
• /en-US/docs/Web/CSS/@font-face/ascent-override
• /en-US/docs/Web/CSS/@font-face/descent-override
• /en-US/docs/Web/CSS/@font-face/font-display
• /en-US/docs/Web/CSS/@font-face/font-family
• /en-US/docs/Web/CSS/@font-face/font-stretch
• /en-US/docs/Web/CSS/@font-face/font-style
• /en-US/docs/Web/CSS/@font-face/font-variant
• /en-US/docs/Web/CSS/@font-face/font-variation-settings
• /en-US/docs/Web/CSS/@font-face/font-weight
• /en-US/docs/Web/CSS/@font-face/line-gap-override
• /en-US/docs/Web/CSS/@font-face/size-adjust
• /en-US/docs/Web/CSS/@font-face/src
• /en-US/docs/Web/CSS/@font-face/unicode-range
• /en-US/docs/Web/CSS/@font-face
• /en-US/docs/Web/CSS/@font-feature-values
• /en-US/docs/Web/CSS/@import
• /en-US/docs/Web/CSS/@keyframes
• /en-US/docs/Web/CSS/@layer
• /en-US/docs/Web/CSS/@media
• /en-US/docs/Web/CSS/@namespace
• /en-US/docs/Web/CSS/@page/size
• /en-US/docs/Web/CSS/@page
• /en-US/docs/Web/CSS/@property/inherits
• /en-US/docs/Web/CSS/@property/initial-value
• /en-US/docs/Web/CSS/@property/syntax
• /en-US/docs/Web/CSS/@property
• /en-US/docs/Web/CSS/@scroll-timeline
• /en-US/docs/Web/CSS/@supports
• /en-US/docs/Web/CSS/@viewport

Flaws (9)

Note! 37 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/CSS/@import
Title: @import
Flaw count: 1

• macros:
  • /en-US/docs/Glossary/user_agents does not exist

---

URL: /en-US/docs/Web/CSS/@page
Title: @page
Flaw count: 4

• macros:
  • /en-US/docs/Web/CSS/:recto does not exist
  • /en-US/docs/Web/CSS/:verso does not exist
• broken_links:
  • Can't resolve /en-US/docs/Web/CSS/@page/page-orientation
• bad_bcd_links:
  • no explanation!

---

URL: /en-US/docs/Web/CSS/@namespace
Title: @namespace
Flaw count: 1

• broken_links:
  • Can't resolve /en-US/docs/Namespaces

---

URL: /en-US/docs/Web/CSS/@color-profile
Title: @color-profile
Flaw count: 1

• bad_bcd_queries:
  • No BCD data for query: css.at-rules.color-profile

---

URL: /en-US/docs/Web/CSS/@counter-style/additive-symbols
Title: additive-symbols
Flaw count: 1

• macros:
  • /en-US/docs/Web/CSS/system redirects to /en-US/docs/Web/CSS/@counter-style/system

---

URL: /en-US/docs/Web/CSS/@media
Title: @media
Flaw count: 1

• bad_bcd_links:
  • no explanation!

[estelle]

looks good!