📦 Release @webref/css@5.0.0

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🤖 This pull request was automatically created to facilitate human review of @webref/css changes triggered by curated data at 1550582.

🧐 Please review the diff below and version numbers. If all looks good, merge this pull request to release the changes to npm.

📦 Latest released @webref/css package was v4.3.4. Merging this pull request will release v5.0.0. Make sure that the bump is the right one for the changes.

✍ If any change needs to be made before release, do not add a commit to this pull request. Changes should rather be handled in a separate pull request and pushed to the main branch. You may leave this pull request open in the meantime, or close it. The pre-release job will automatically update this pull request or create a new one once the updates have made their way to the main branch.

🛈 The actual change introduced by this pull request is a version bump in packages/css/package.json. You do not need to review that change. The bumped version is not the version that will be released when this pull request is merged, but rather the version that will be released next time.

IMPORTANT:
- Diff is too long to render in a PR description: 104753 characters
- First 60000 characters shown below
- Check the action log for the full diff

Static file(s) changed:
+ README.md

New repo files that are not yet in the released package:
+ css-nesting.json

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/CSS.json packages/css/CSS.json
--- webref/node_modules/@webref/css/CSS.json
+++ packages/css/CSS.json
@@ -65,7 +65,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<uri>": {
       "prose": "URI values (Uniform Resource Identifiers, see [RFC3986], which includes URLs, URNs, etc) in this specification are denoted by <uri>. The functional notation used to designate URIs in property values is \"url()\", as in:"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/SVG.json packages/css/SVG.json
--- webref/node_modules/@webref/css/SVG.json
+++ packages/css/SVG.json
@@ -338,7 +338,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<points>": {
       "value": "[ <number>+ ]#"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/compat.json packages/css/compat.json
--- webref/node_modules/@webref/css/compat.json
+++ packages/css/compat.json
@@ -593,23 +593,23 @@
       ]
     }
   },
-  "descriptors": {
-    "-webkit-device-pixel-ratio": [
-      {
-        "name": "-webkit-device-pixel-ratio",
-        "for": "@media",
-        "value": "<number>",
-        "type": "range"
-      }
-    ],
-    "-webkit-transform-3d": [
-      {
-        "name": "-webkit-transform-3d",
-        "for": "@media",
-        "value": "<mq-boolean>",
-        "acceptsMin/maxPrefixes": "no"
-      }
-    ]
+  "atrules": {
+    "@media": {
+      "descriptors": [
+        {
+          "name": "-webkit-device-pixel-ratio",
+          "for": "@media",
+          "value": "<number>",
+          "type": "range"
+        },
+        {
+          "name": "-webkit-transform-3d",
+          "for": "@media",
+          "value": "<mq-boolean>",
+          "acceptsMin/maxPrefixes": "no"
+        }
+      ]
+    }
   },
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/compositing.json packages/css/compositing.json
--- webref/node_modules/@webref/css/compositing.json
+++ packages/css/compositing.json
@@ -52,7 +52,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<blend-mode>": {
       "value": "normal | multiply | screen | overlay | darken | lighten | color-dodge |color-burn | hard-light | soft-light | difference | exclusion | hue | saturation | color | luminosity"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-align.json packages/css/css-align.json
--- webref/node_modules/@webref/css/css-align.json
+++ packages/css/css-align.json
@@ -205,7 +205,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<self-position>": {
       "value": "center | start | end | self-start | self-end | flex-start | flex-end"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-animations-2.json packages/css/css-animations-2.json
--- webref/node_modules/@webref/css/css-animations-2.json
+++ packages/css/css-animations-2.json
@@ -35,7 +35,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<single-animation-composition>": {
       "value": "replace | add | accumulate"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-animations.json packages/css/css-animations.json
--- webref/node_modules/@webref/css/css-animations.json
+++ packages/css/css-animations.json
@@ -139,7 +139,12 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {
+    "@keyframes": {
+      "value": "@keyframes <keyframes-name> { <rule-list> }",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<single-animation-iteration-count>": {
       "value": "infinite | <number [0,∞]>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-backgrounds-4.json packages/css/css-backgrounds-4.json
--- webref/node_modules/@webref/css/css-backgrounds-4.json
+++ packages/css/css-backgrounds-4.json
@@ -304,7 +304,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<position>": {
       "value": "[ [ left | center | right | top | bottom | start | end | <length-percentage> ] | [ left | center | right | x-start | x-end | <length-percentage> ] [ top | center | bottom | y-start | y-end | <length-percentage> ] | [ center | [ left | right | x-start | x-end ] <length-percentage>? ] && [ center | [ top | bottom | y-start | y-end ] <length-percentage>? ] | [ center | [ start | end ] <length-percentage>? ] [ center | [ start | end ] <length-percentage>? ] ]"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-backgrounds.json packages/css/css-backgrounds.json
--- webref/node_modules/@webref/css/css-backgrounds.json
+++ packages/css/css-backgrounds.json
@@ -618,7 +618,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<bg-image>": {
       "value": "<image> | none"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-box.json packages/css/css-box.json
--- webref/node_modules/@webref/css/css-box.json
+++ packages/css/css-box.json
@@ -168,7 +168,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<visual-box>": {
       "value": "content-box | padding-box | border-box"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-break.json packages/css/css-break.json
--- webref/node_modules/@webref/css/css-break.json
+++ packages/css/css-break.json
@@ -108,6 +108,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-cascade-6.json packages/css/css-cascade-6.json
--- webref/node_modules/@webref/css/css-cascade-6.json
+++ packages/css/css-cascade-6.json
@@ -4,7 +4,12 @@
     "url": "https://drafts.csswg.org/css-cascade-6/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {
+    "@scope": {
+      "value": "@scope (<scope-start>) [to (<scope-end>)]? { <stylesheet> }",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<scope-start>": {
       "prose": "The <scope-start> is a <forgiving-selector-list>. Each element matched by <scope-start> is a scoping element, creating a scope with itself as the scoping root."

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-cascade.json packages/css/css-cascade.json
--- webref/node_modules/@webref/css/css-cascade.json
+++ packages/css/css-cascade.json
@@ -19,10 +19,19 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {
+    "@import": {
+      "value": "@import [ <url> | <string> ] [ layer | layer(<layer-name>) ]? <import-condition> ;",
+      "descriptors": []
+    },
+    "@layer": {
+      "value": "@layer <layer-name>? { <stylesheet> }",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
-    "<import-condition>": {
-      "value": "[ supports( [ <supports-condition> | <declaration> ] ) ]? <media-query-list>? ;"
+    "<import-conditions>": {
+      "value": "[ supports( [ <supports-condition> | <declaration> ] ) ]? <media-query-list>?"
     },
     "<layer-name>": {
       "value": "<ident> [ '.' <ident> ]*"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-color-5.json packages/css/css-color-5.json
--- webref/node_modules/@webref/css/css-color-5.json
+++ packages/css/css-color-5.json
@@ -4,31 +4,30 @@
     "url": "https://drafts.csswg.org/css-color-5/"
   },
   "properties": {},
-  "descriptors": {
-    "src": [
-      {
-        "name": "src",
-        "for": "@color-profile",
-        "value": "<url>",
-        "initial": "n/a"
-      }
-    ],
-    "rendering-intent": [
-      {
-        "name": "rendering-intent",
-        "for": "@color-profile",
-        "value": "relative-colorimetric | absolute-colorimetric | perceptual | saturation",
-        "initial": "relative-colorimetric"
-      }
-    ],
-    "components": [
-      {
-        "name": "components",
-        "for": "@color-profile",
-        "value": "<ident>#",
-        "initial": "n/a"
-      }
-    ]
+  "atrules": {
+    "@color-profile": {
+      "value": "@color-profile [<dashed-ident> | device-cmyk] { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "src",
+          "for": "@color-profile",
+          "value": "<url>",
+          "initial": "n/a"
+        },
+        {
+          "name": "rendering-intent",
+          "for": "@color-profile",
+          "value": "relative-colorimetric | absolute-colorimetric | perceptual | saturation",
+          "initial": "relative-colorimetric"
+        },
+        {
+          "name": "components",
+          "for": "@color-profile",
+          "value": "<ident>#",
+          "initial": "n/a"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<color-mix()>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-color-adjust.json packages/css/css-color-adjust.json
--- webref/node_modules/@webref/css/css-color-adjust.json
+++ packages/css/css-color-adjust.json
@@ -65,6 +65,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-color.json packages/css/css-color.json
--- webref/node_modules/@webref/css/css-color.json
+++ packages/css/css-color.json
@@ -1,7 +1,7 @@
 {
   "spec": {
     "title": "CSS Color Module Level 4",
-    "url": "https://drafts.csswg.org/css-color/"
+    "url": "https://drafts.csswg.org/css-color-4/"
   },
   "properties": {
     "color": {
@@ -33,7 +33,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<color>": {
       "prose": "Colors in CSS are represented by the <color> type:",

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-conditional-4.json packages/css/css-conditional-4.json
--- webref/node_modules/@webref/css/css-conditional-4.json
+++ packages/css/css-conditional-4.json
@@ -4,7 +4,7 @@
     "url": "https://drafts.csswg.org/css-conditional-4/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<supports-feature>": {
       "value": "<supports-selector-fn> | <supports-decl>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-conditional-5.json packages/css/css-conditional-5.json
--- webref/node_modules/@webref/css/css-conditional-5.json
+++ packages/css/css-conditional-5.json
@@ -4,7 +4,16 @@
     "url": "https://drafts.csswg.org/css-conditional-5/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {
+    "@when": {
+      "value": "@when <boolean-condition> { <stylesheet> }",
+      "descriptors": []
+    },
+    "@else": {
+      "value": "@else <boolean-condition>? { <stylesheet> }",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<supports-feature>": {
       "value": "<supports-selector-fn> | <supports-font-tech-fn> | <supports-font-format-fn> | <supports-decl>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-conditional.json packages/css/css-conditional.json
--- webref/node_modules/@webref/css/css-conditional.json
+++ packages/css/css-conditional.json
@@ -4,7 +4,16 @@
     "url": "https://drafts.csswg.org/css-conditional-3/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {
+    "@media": {
+      "value": "@media <media-query-list> { <stylesheet> }",
+      "descriptors": []
+    },
+    "@supports": {
+      "value": "@supports <supports-condition> { <stylesheet> }",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<supports-condition>": {
       "value": "not <supports-in-parens> | <supports-in-parens> [ and <supports-in-parens> ]* | <supports-in-parens> [ or <supports-in-parens> ]*"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-contain-3.json packages/css/css-contain-3.json
--- webref/node_modules/@webref/css/css-contain-3.json
+++ packages/css/css-contain-3.json
@@ -56,55 +56,48 @@
       ]
     }
   },
-  "descriptors": {
-    "width": [
-      {
-        "name": "width",
-        "for": "@container",
-        "value": "<length>",
-        "type": "range"
-      }
-    ],
-    "height": [
-      {
-        "name": "height",
-        "for": "@container",
-        "value": "<length>",
-        "type": "range"
-      }
-    ],
-    "inline-size": [
-      {
-        "name": "inline-size",
-        "for": "@container",
-        "value": "<length>",
-        "type": "range"
-      }
-    ],
-    "block-size": [
-      {
-        "name": "block-size",
-        "for": "@container",
-        "value": "<length>",
-        "type": "range"
-      }
-    ],
-    "aspect-ratio": [
-      {
-        "name": "aspect-ratio",
-        "for": "@container",
-        "value": "<ratio>",
-        "type": "range"
-      }
-    ],
-    "orientation": [
-      {
-        "name": "orientation",
-        "for": "@container",
-        "value": "portrait | landscape",
-        "type": "discrete"
-      }
-    ]
+  "atrules": {
+    "@container": {
+      "value": "@container [ <container-name> ]? <container-condition> { <stylesheet> }",
+      "descriptors": [
+        {
+          "name": "width",
+          "for": "@container",
+          "value": "<length>",
+          "type": "range"
+        },
+        {
+          "name": "height",
+          "for": "@container",
+          "value": "<length>",
+          "type": "range"
+        },
+        {
+          "name": "inline-size",
+          "for": "@container",
+          "value": "<length>",
+          "type": "range"
+        },
+        {
+          "name": "block-size",
+          "for": "@container",
+          "value": "<length>",
+          "type": "range"
+        },
+        {
+          "name": "aspect-ratio",
+          "for": "@container",
+          "value": "<ratio>",
+          "type": "range"
+        },
+        {
+          "name": "orientation",
+          "for": "@container",
+          "value": "portrait | landscape",
+          "type": "discrete"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<size-feature>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-contain.json packages/css/css-contain.json
--- webref/node_modules/@webref/css/css-contain.json
+++ packages/css/css-contain.json
@@ -34,6 +34,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-content.json packages/css/css-content.json
--- webref/node_modules/@webref/css/css-content.json
+++ packages/css/css-content.json
@@ -93,7 +93,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<content-replacement>": {
       "value": "<image>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-counter-styles.json packages/css/css-counter-styles.json
--- webref/node_modules/@webref/css/css-counter-styles.json
+++ packages/css/css-counter-styles.json
@@ -4,87 +4,72 @@
     "url": "https://drafts.csswg.org/css-counter-styles/"
   },
   "properties": {},
-  "descriptors": {
-    "system": [
-      {
-        "name": "system",
-        "for": "@counter-style",
-        "value": "cyclic | numeric | alphabetic | symbolic | additive | [fixed <integer>?] | [ extends <counter-style-name> ]",
-        "initial": "symbolic"
-      }
-    ],
-    "negative": [
-      {
-        "name": "negative",
-        "for": "@counter-style",
-        "value": "<symbol> <symbol>?",
-        "initial": "\"\\2D\" (\"-\" hyphen-minus)"
-      }
-    ],
-    "prefix": [
-      {
-        "name": "prefix",
-        "for": "@counter-style",
-        "value": "<symbol>",
-        "initial": "\"\" (the empty string)"
-      }
-    ],
-    "suffix": [
-      {
-        "name": "suffix",
-        "for": "@counter-style",
-        "value": "<symbol>",
-        "initial": "\"\\2E\\20\" (\".\" full stop followed by a space)"
-      }
-    ],
-    "range": [
-      {
-        "name": "range",
-        "for": "@counter-style",
-        "value": "[ [ <integer> | infinite ]{2} ]# | auto",
-        "initial": "auto"
-      }
-    ],
-    "pad": [
-      {
-        "name": "pad",
-        "for": "@counter-style",
-        "value": "<integer [0,∞]> && <symbol>",
-        "initial": "0 \"\""
-      }
-    ],
-    "fallback": [
-      {
-        "name": "fallback",
-        "for": "@counter-style",
-        "value": "<counter-style-name>",
-        "initial": "decimal"
-      }
-    ],
-    "symbols": [
-      {
-        "name": "symbols",
-        "for": "@counter-style",
-        "value": "<symbol>+",
-        "initial": "n/a"
-      }
-    ],
-    "additive-symbols": [
-      {
-        "name": "additive-symbols",
-        "for": "@counter-style",
-        "value": "[ <integer [0,∞]> && <symbol> ]#",
-        "initial": "n/a"
-      }
-    ],
-    "speak-as": [
-      {
-        "name": "speak-as",
-        "for": "@counter-style",
-        "value": "auto | bullets | numbers | words | spell-out | <counter-style-name>",
-        "initial": "auto"
-      }
-    ]
+  "atrules": {
+    "@counter-style": {
+      "value": "@counter-style <counter-style-name> { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "system",
+          "for": "@counter-style",
+          "value": "cyclic | numeric | alphabetic | symbolic | additive | [fixed <integer>?] | [ extends <counter-style-name> ]",
+          "initial": "symbolic"
+        },
+        {
+          "name": "negative",
+          "for": "@counter-style",
+          "value": "<symbol> <symbol>?",
+          "initial": "\"\\2D\" (\"-\" hyphen-minus)"
+        },
+        {
+          "name": "prefix",
+          "for": "@counter-style",
+          "value": "<symbol>",
+          "initial": "\"\" (the empty string)"
+        },
+        {
+          "name": "suffix",
+          "for": "@counter-style",
+          "value": "<symbol>",
+          "initial": "\"\\2E\\20\" (\".\" full stop followed by a space)"
+        },
+        {
+          "name": "range",
+          "for": "@counter-style",
+          "value": "[ [ <integer> | infinite ]{2} ]# | auto",
+          "initial": "auto"
+        },
+        {
+          "name": "pad",
+          "for": "@counter-style",
+          "value": "<integer [0,∞]> && <symbol>",
+          "initial": "0 \"\""
+        },
+        {
+          "name": "fallback",
+          "for": "@counter-style",
+          "value": "<counter-style-name>",
+          "initial": "decimal"
+        },
+        {
+          "name": "symbols",
+          "for": "@counter-style",
+          "value": "<symbol>+",
+          "initial": "n/a"
+        },
+        {
+          "name": "additive-symbols",
+          "for": "@counter-style",
+          "value": "[ <integer [0,∞]> && <symbol> ]#",
+          "initial": "n/a"
+        },
+        {
+          "name": "speak-as",
+          "for": "@counter-style",
+          "value": "auto | bullets | numbers | words | spell-out | <counter-style-name>",
+          "initial": "auto"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<counter-style-name>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-device-adapt.json packages/css/css-device-adapt.json
--- webref/node_modules/@webref/css/css-device-adapt.json
+++ packages/css/css-device-adapt.json
@@ -4,117 +4,99 @@
     "url": "https://drafts.csswg.org/css-device-adapt/"
   },
   "properties": {},
-  "descriptors": {
-    "min-width": [
-      {
-        "name": "min-width",
-        "for": "@viewport",
-        "value": "<viewport-length>",
-        "initial": "auto",
-        "percentages": "Refer to the width of the initial viewport",
-        "computedValue": "auto, an absolute length, or a percentage as specified"
-      }
-    ],
-    "max-width": [
-      {
-        "name": "max-width",
-        "for": "@viewport",
-        "value": "<viewport-length>",
-        "initial": "auto",
-        "percentages": "Refer to the width of the initial viewport",
-        "computedValue": "auto, an absolute length, or a percentage as specified"
-      }
-    ],
-    "width": [
-      {
-        "name": "width",
-        "for": "@viewport",
-        "value": "<viewport-length>{1,2}",
-        "initial": "See individual descriptors",
-        "percentages": "See individual descriptors",
-        "computedValue": "See individual descriptors"
-      }
-    ],
-    "min-height": [
-      {
-        "name": "min-height",
-        "for": "@viewport",
-        "value": "<viewport-length>",
-        "initial": "auto",
-        "percentages": "Refer to the height of the initial viewport",
-        "computedValue": "auto, an absolute length, or a percentage as specified"
-      }
-    ],
-    "max-height": [
-      {
-        "name": "max-height",
-        "for": "@viewport",
-        "value": "<viewport-length>",
-        "initial": "auto",
-        "percentages": "Refer to the height of the initial viewport",
-        "computedValue": "auto, an absolute length, or a percentage as specified"
-      }
-    ],
-    "height": [
-      {
-        "name": "height",
-        "for": "@viewport",
-        "value": "<viewport-length>{1,2}",
-        "initial": "See individual descriptors",
-        "percentages": "See individual descriptors",
-        "computedValue": "See individual descriptors"
-      }
-    ],
-    "zoom": [
-      {
-        "name": "zoom",
-        "for": "@viewport",
-        "value": "auto | <number> | <percentage>",
-        "initial": "auto",
-        "percentages": "The zoom factor itself",
-        "computedValue": "auto, or a non-negative number or percentage as specified"
-      }
-    ],
-    "min-zoom": [
-      {
-        "name": "min-zoom",
-        "for": "@viewport",
-        "value": "auto | <number> | <percentage>",
-        "initial": "auto",
-        "percentages": "The zoom factor itself",
-        "computedValue": "auto, or a non-negative number or percentage as specified"
-      }
-    ],
-    "max-zoom": [
-      {
-        "name": "max-zoom",
-        "for": "@viewport",
-        "value": "auto | <number> | <percentage>",
-        "initial": "auto",
-        "percentages": "The zoom factor itself",
-        "computedValue": "auto, or a non-negative number or percentage as specified"
-      }
-    ],
-    "user-zoom": [
-      {
-        "name": "user-zoom",
-        "for": "@viewport",
-        "value": "zoom | fixed",
-        "initial": "zoom",
-        "percentages": "N/A",
-        "computedValue": "as specified"
-      }
-    ],
-    "orientation": [
-      {
-        "name": "orientation",
-        "for": "@viewport",
-        "value": "auto | portrait | landscape",
-        "initial": "auto",
-        "percentages": "N/A",
-        "computedValue": "as specified"
-      }
-    ]
+  "atrules": {
+    "@viewport": {
+      "descriptors": [
+        {
+          "name": "min-width",
+          "for": "@viewport",
+          "value": "<viewport-length>",
+          "initial": "auto",
+          "percentages": "Refer to the width of the initial viewport",
+          "computedValue": "auto, an absolute length, or a percentage as specified"
+        },
+        {
+          "name": "max-width",
+          "for": "@viewport",
+          "value": "<viewport-length>",
+          "initial": "auto",
+          "percentages": "Refer to the width of the initial viewport",
+          "computedValue": "auto, an absolute length, or a percentage as specified"
+        },
+        {
+          "name": "width",
+          "for": "@viewport",
+          "value": "<viewport-length>{1,2}",
+          "initial": "See individual descriptors",
+          "percentages": "See individual descriptors",
+          "computedValue": "See individual descriptors"
+        },
+        {
+          "name": "min-height",
+          "for": "@viewport",
+          "value": "<viewport-length>",
+          "initial": "auto",
+          "percentages": "Refer to the height of the initial viewport",
+          "computedValue": "auto, an absolute length, or a percentage as specified"
+        },
+        {
+          "name": "max-height",
+          "for": "@viewport",
+          "value": "<viewport-length>",
+          "initial": "auto",
+          "percentages": "Refer to the height of the initial viewport",
+          "computedValue": "auto, an absolute length, or a percentage as specified"
+        },
+        {
+          "name": "height",
+          "for": "@viewport",
+          "value": "<viewport-length>{1,2}",
+          "initial": "See individual descriptors",
+          "percentages": "See individual descriptors",
+          "computedValue": "See individual descriptors"
+        },
+        {
+          "name": "zoom",
+          "for": "@viewport",
+          "value": "auto | <number> | <percentage>",
+          "initial": "auto",
+          "percentages": "The zoom factor itself",
+          "computedValue": "auto, or a non-negative number or percentage as specified"
+        },
+        {
+          "name": "min-zoom",
+          "for": "@viewport",
+          "value": "auto | <number> | <percentage>",
+          "initial": "auto",
+          "percentages": "The zoom factor itself",
+          "computedValue": "auto, or a non-negative number or percentage as specified"
+        },
+        {
+          "name": "max-zoom",
+          "for": "@viewport",
+          "value": "auto | <number> | <percentage>",
+          "initial": "auto",
+          "percentages": "The zoom factor itself",
+          "computedValue": "auto, or a non-negative number or percentage as specified"
+        },
+        {
+          "name": "user-zoom",
+          "for": "@viewport",
+          "value": "zoom | fixed",
+          "initial": "zoom",
+          "percentages": "N/A",
+          "computedValue": "as specified"
+        },
+        {
+          "name": "orientation",
+          "for": "@viewport",
+          "value": "auto | portrait | landscape",
+          "initial": "auto",
+          "percentages": "N/A",
+          "computedValue": "as specified"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<viewport-length>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-display.json packages/css/css-display.json
--- webref/node_modules/@webref/css/css-display.json
+++ packages/css/css-display.json
@@ -48,7 +48,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<display-outside>": {
       "value": "block | inline | run-in"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-easing.json packages/css/css-easing.json
--- webref/node_modules/@webref/css/css-easing.json
+++ packages/css/css-easing.json
@@ -4,7 +4,7 @@
     "url": "https://drafts.csswg.org/css-easing/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<easing-function>": {
       "value": "linear | <linear-easing-function> | <cubic-bezier-easing-function> | <step-easing-function>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-env.json packages/css/css-env.json
--- webref/node_modules/@webref/css/css-env.json
+++ packages/css/css-env.json
@@ -4,7 +4,7 @@
     "url": "https://drafts.csswg.org/css-env-1/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<env()>": {
       "value": "env( <custom-ident> <integer [0,∞]>*, <declaration-value>? )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-exclusions.json packages/css/css-exclusions.json
--- webref/node_modules/@webref/css/css-exclusions.json
+++ packages/css/css-exclusions.json
@@ -33,6 +33,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-extensions.json packages/css/css-extensions.json
--- webref/node_modules/@webref/css/css-extensions.json
+++ packages/css/css-extensions.json
@@ -4,7 +4,12 @@
     "url": "https://drafts.csswg.org/css-extensions-1/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {
+    "@custom-selector": {
+      "value": "@custom-selector <custom-selector> <selector-list> ;",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<extension-name>": {
       "prose": "All extensions defined in this specification use a common syntax for defining their ”names”: the <extension-name> production. An <extension-name> is any identifier that starts with two dashes (U+002D HYPHEN-MINUS), like --foo, or even exotic names like -- or ------. The CSS language will never use identifiers of this form for any language-defined purpose, so it’s safe to use them for author-defined purposes without ever having to worry about colliding with CSS-defined names."

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-flexbox.json packages/css/css-flexbox.json
--- webref/node_modules/@webref/css/css-flexbox.json
+++ packages/css/css-flexbox.json
@@ -109,6 +109,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-fonts-5.json packages/css/css-fonts-5.json
--- webref/node_modules/@webref/css/css-fonts-5.json
+++ packages/css/css-fonts-5.json
@@ -20,79 +20,65 @@
       ]
     }
   },
-  "descriptors": {
-    "font-size": [
-      {
-        "name": "font-size",
-        "for": "@font-face",
-        "value": "auto | [<number>]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "size-adjust": [
-      {
-        "name": "size-adjust",
-        "for": "@font-face",
-        "value": "<percentage [0,∞]>",
-        "initial": "100%"
-      }
-    ],
-    "ascent-override": [
-      {
-        "name": "ascent-override",
-        "for": "@font-face",
-        "value": "[ normal | <percentage [0,∞]> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "descent-override": [
-      {
-        "name": "descent-override",
-        "for": "@font-face",
-        "value": "[ normal | <percentage [0,∞]> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "line-gap-override": [
-      {
-        "name": "line-gap-override",
-        "for": "@font-face",
-        "value": "[ normal | <percentage [0,∞]> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "superscript-position-override": [
-      {
-        "name": "superscript-position-override",
-        "for": "@font-face",
-        "value": "[ normal | from-font | <percentage> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "subscript-position-override": [
-      {
-        "name": "subscript-position-override",
-        "for": "@font-face",
-        "value": "[ normal | from-font | <percentage> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "superscript-size-override": [
-      {
-        "name": "superscript-size-override",
-        "for": "@font-face",
-        "value": "[ normal | from-font | <percentage [0,∞]> ]{1,2}",
-        "initial": "normal"
-      }
-    ],
-    "subscript-size-override": [
-      {
-        "name": "subscript-size-override",
-        "for": "@font-face",
-        "value": "[ normal | from-font | <percentage [0,∞]> ]{1,2}",
-        "initial": "normal"
-      }
-    ]
+  "atrules": {
+    "@font-face": {
+      "descriptors": [
+        {
+          "name": "font-size",
+          "for": "@font-face",
+          "value": "auto | [<number>]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "size-adjust",
+          "for": "@font-face",
+          "value": "<percentage [0,∞]>",
+          "initial": "100%"
+        },
+        {
+          "name": "ascent-override",
+          "for": "@font-face",
+          "value": "[ normal | <percentage [0,∞]> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "descent-override",
+          "for": "@font-face",
+          "value": "[ normal | <percentage [0,∞]> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "line-gap-override",
+          "for": "@font-face",
+          "value": "[ normal | <percentage [0,∞]> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "superscript-position-override",
+          "for": "@font-face",
+          "value": "[ normal | from-font | <percentage> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "subscript-position-override",
+          "for": "@font-face",
+          "value": "[ normal | from-font | <percentage> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "superscript-size-override",
+          "for": "@font-face",
+          "value": "[ normal | from-font | <percentage [0,∞]> ]{1,2}",
+          "initial": "normal"
+        },
+        {
+          "name": "subscript-size-override",
+          "for": "@font-face",
+          "value": "[ normal | from-font | <percentage [0,∞]> ]{1,2}",
+          "initial": "normal"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<font-format>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-fonts.json packages/css/css-fonts.json
--- webref/node_modules/@webref/css/css-fonts.json
+++ packages/css/css-fonts.json
@@ -381,147 +381,130 @@
       ]
     }
   },
-  "descriptors": {
-    "font-family": [
-      {
-        "name": "font-family",
-        "for": "@font-face",
-        "value": "<family-name>",
-        "initial": "N/A"
-      },
-      {
-        "name": "font-family",
-        "for": "@font-palette-values",
-        "value": "<'font-family'>",
-        "initial": "N/A"
-      }
-    ],
-    "src": [
-      {
-        "name": "src",
-        "for": "@font-face",
-        "value": "see prose",
-        "initial": "N/A"
-      }
-    ],
-    "font-style": [
-      {
-        "name": "font-style",
-        "for": "@font-face",
-        "value": "auto | normal | italic | oblique [ <angle>{1,2} ]?",
-        "initial": "auto"
-      }
-    ],
-    "font-weight": [
-      {
-        "name": "font-weight",
-        "for": "@font-face",
-        "value": "auto | <font-weight-absolute>{1,2}",
-        "initial": "auto"
-      }
-    ],
-    "font-stretch": [
-      {
-        "name": "font-stretch",
-        "for": "@font-face",
-        "value": "auto | <'font-stretch'>{1,2}",
-        "initial": "auto"
-      }
-    ],
-    "unicode-range": [
-      {
-        "name": "unicode-range",
-        "for": "@font-face",
-        "value": "<urange>#",
-        "initial": "U+0-10FFFF"
-      }
-    ],
-    "font-feature-settings": [
-      {
-        "name": "font-feature-settings",
-        "for": "@font-face",
-        "value": "normal | <feature-tag-value>#",
-        "initial": "normal"
-      }
-    ],
-    "font-variation-settings": [
-      {
-        "name": "font-variation-settings",
-        "for": "@font-face",
-        "value": "normal | [ <string> <number>]#",
-        "initial": "normal"
-      }
-    ],
-    "font-named-instance": [
-      {
-        "name": "font-named-instance",
-        "for": "@font-face",
-        "value": "auto | <string>",
-        "initial": "auto"
-      }
-    ],
-    "font-display": [
-      {
-        "name": "font-display",
-        "for": "@font-face",
-        "value": "auto | block | swap | fallback | optional",
-        "initial": "auto"
-      },
-      {
-        "name": "font-display",
-        "for": "@font-feature-values",
-        "value": "auto | block | swap | fallback | optional",
-        "initial": "auto"
-      }
-    ],
-    "font-language-override": [
-      {
-        "name": "font-language-override",
-        "for": "@font-face",
-        "value": "normal | <string>",
-        "initial": "normal"
-      }
-    ],
-    "ascent-override": [
-      {
-        "name": "ascent-override",
-        "for": "@font-face",
-        "value": "normal | <percentage [0,∞]>",
-        "initial": "normal"
-      }
-    ],
-    "descent-override": [
-      {
-        "name": "descent-override",
-        "for": "@font-face",
-        "value": "normal | <percentage [0,∞]>",
-        "initial": "normal"
-      }
-    ],
-    "line-gap-override": [
-      {
-        "name": "line-gap-override",
-        "for": "@font-face",
-        "value": "normal | <percentage [0,∞]>",
-        "initial": "normal"
-      }
-    ],
-    "base-palette": [
-      {
-        "name": "base-palette",
-        "for": "@font-palette-values",
-        "value": "light | dark | <integer [0,∞]>",
-        "initial": "N/A"
-      }
-    ],
-    "override-colors": [
-      {
-        "name": "override-colors",
-        "for": "@font-palette-values",
-        "value": "[ <integer [0,∞]> <absolute-color-base> ]#",
-        "initial": "N/A"
-      }
-    ]
+  "atrules": {
+    "@font-face": {
+      "value": "@font-face { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "font-family",
+          "for": "@font-face",
+          "value": "<family-name>",
+          "initial": "N/A"
+        },
+        {
+          "name": "src",
+          "for": "@font-face",
+          "value": "see prose",
+          "initial": "N/A"
+        },
+        {
+          "name": "font-style",
+          "for": "@font-face",
+          "value": "auto | normal | italic | oblique [ <angle>{1,2} ]?",
+          "initial": "auto"
+        },
+        {
+          "name": "font-weight",
+          "for": "@font-face",
+          "value": "auto | <font-weight-absolute>{1,2}",
+          "initial": "auto"
+        },
+        {
+          "name": "font-stretch",
+          "for": "@font-face",
+          "value": "auto | <'font-stretch'>{1,2}",
+          "initial": "auto"
+        },
+        {
+          "name": "unicode-range",
+          "for": "@font-face",
+          "value": "<urange>#",
+          "initial": "U+0-10FFFF"
+        },
+        {
+          "name": "font-feature-settings",
+          "for": "@font-face",
+          "value": "normal | <feature-tag-value>#",
+          "initial": "normal"
+        },
+        {
+          "name": "font-variation-settings",
+          "for": "@font-face",
+          "value": "normal | [ <string> <number>]#",
+          "initial": "normal"
+        },
+        {
+          "name": "font-named-instance",
+          "for": "@font-face",
+          "value": "auto | <string>",
+          "initial": "auto"
+        },
+        {
+          "name": "font-display",
+          "for": "@font-face",
+          "value": "auto | block | swap | fallback | optional",
+          "initial": "auto"
+        },
+        {
+          "name": "font-language-override",
+          "for": "@font-face",
+          "value": "normal | <string>",
+          "initial": "normal"
+        },
+        {
+          "name": "ascent-override",
+          "for": "@font-face",
+          "value": "normal | <percentage [0,∞]>",
+          "initial": "normal"
+        },
+        {
+          "name": "descent-override",
+          "for": "@font-face",
+          "value": "normal | <percentage [0,∞]>",
+          "initial": "normal"
+        },
+        {
+          "name": "line-gap-override",
+          "for": "@font-face",
+          "value": "normal | <percentage [0,∞]>",
+          "initial": "normal"
+        }
+      ]
+    },
+    "@font-feature-values": {
+      "value": "@font-feature-values <family-name># { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "font-display",
+          "for": "@font-feature-values",
+          "value": "auto | block | swap | fallback | optional",
+          "initial": "auto"
+        }
+      ]
+    },
+    "@font-palette-values": {
+      "value": "@font-palette-values <dashed-ident> { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "font-family",
+          "for": "@font-palette-values",
+          "value": "<'font-family'>",
+          "initial": "N/A"
+        },
+        {
+          "name": "base-palette",
+          "for": "@font-palette-values",
+          "value": "light | dark | <integer [0,∞]>",
+          "initial": "N/A"
+        },
+        {
+          "name": "override-colors",
+          "for": "@font-palette-values",
+          "value": "[ <integer [0,∞]> <absolute-color-base> ]#",
+          "initial": "N/A"
+        }
+      ]
+    }
   },
   "valuespaces": {
     "<family-name>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-gcpm-4.json packages/css/css-gcpm-4.json
--- webref/node_modules/@webref/css/css-gcpm-4.json
+++ packages/css/css-gcpm-4.json
@@ -20,6 +20,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-gcpm.json packages/css/css-gcpm.json
--- webref/node_modules/@webref/css/css-gcpm.json
+++ packages/css/css-gcpm.json
@@ -56,7 +56,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<running()>": {
       "value": "running( <custom-ident> )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-grid-3.json packages/css/css-grid-3.json
--- webref/node_modules/@webref/css/css-grid-3.json
+++ packages/css/css-grid-3.json
@@ -78,6 +78,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-grid.json packages/css/css-grid.json
--- webref/node_modules/@webref/css/css-grid.json
+++ packages/css/css-grid.json
@@ -229,7 +229,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<repeat()>": {
       "prose": "The repeat() notation represents a repeated fragment of the track list, allowing a large number of columns or rows that exhibit a recurring pattern to be written in a more compact form."

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-highlight-api.json packages/css/css-highlight-api.json
--- webref/node_modules/@webref/css/css-highlight-api.json
+++ packages/css/css-highlight-api.json
@@ -4,7 +4,7 @@
     "url": "https://drafts.csswg.org/css-highlight-api-1/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<custom-highlight-name>": {
       "prose": "The ::highlight(<custom-highlight-name>) pseudo-element (also known as the custom highlight pseudo-element) represents the portion of a document that is being contained or partially contained in all the ranges of the registered custom highlight with the custom highlight name <custom-highlight-name>, if any. <custom-highlight-name> must be a valid CSS <ident-token>."

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-images-4.json packages/css/css-images-4.json
--- webref/node_modules/@webref/css/css-images-4.json
+++ packages/css/css-images-4.json
@@ -50,7 +50,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<type()>": {
       "value": "type( <string> )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-images.json packages/css/css-images.json
--- webref/node_modules/@webref/css/css-images.json
+++ packages/css/css-images.json
@@ -65,7 +65,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<size>": {
       "prose": "Both circle and ellipse gradients accept the following keywords as their <size>:",

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-inline.json packages/css/css-inline.json
--- webref/node_modules/@webref/css/css-inline.json
+++ packages/css/css-inline.json
@@ -181,6 +181,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-line-grid.json packages/css/css-line-grid.json
--- webref/node_modules/@webref/css/css-line-grid.json
+++ packages/css/css-line-grid.json
@@ -50,6 +50,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-lists.json packages/css/css-lists.json
--- webref/node_modules/@webref/css/css-lists.json
+++ packages/css/css-lists.json
@@ -125,7 +125,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<counter-name>": {
       "prose": "Counters are referred to in CSS syntax using the <counter-name> type, which represents their name as a <custom-ident>. A <counter-name> name cannot match the keyword none; such an identifier is invalid as a <counter-name>."

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-logical.json packages/css/css-logical.json
--- webref/node_modules/@webref/css/css-logical.json
+++ packages/css/css-logical.json
@@ -695,6 +695,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-masking.json packages/css/css-masking.json
--- webref/node_modules/@webref/css/css-masking.json
+++ packages/css/css-masking.json
@@ -323,7 +323,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<rect()>": {
       "value": "rect( <top>, <right>, <bottom>, <left> )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-multicol-2.json packages/css/css-multicol-2.json
--- webref/node_modules/@webref/css/css-multicol-2.json
+++ packages/css/css-multicol-2.json
@@ -20,6 +20,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-multicol.json packages/css/css-multicol.json
--- webref/node_modules/@webref/css/css-multicol.json
+++ packages/css/css-multicol.json
@@ -139,6 +139,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-namespaces.json packages/css/css-namespaces.json
--- webref/node_modules/@webref/css/css-namespaces.json
+++ packages/css/css-namespaces.json
@@ -4,7 +4,12 @@
     "url": "https://drafts.csswg.org/css-namespaces/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {
+    "@namespace": {
+      "value": "@namespace <namespace-prefix>? [ <string> | <url> ] ;",
+      "descriptors": []
+    }
+  },
   "valuespaces": {
     "<namespace-prefix>": {
       "value": "<ident>"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-nav.json packages/css/css-nav.json
--- webref/node_modules/@webref/css/css-nav.json
+++ packages/css/css-nav.json
@@ -47,6 +47,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-overflow-4.json packages/css/css-overflow-4.json
--- webref/node_modules/@webref/css/css-overflow-4.json
+++ packages/css/css-overflow-4.json
@@ -50,10 +50,10 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<fade()>": {
-      "value": "fade( <length> | <percentage> )"
+      "value": "fade( [ <length> | <percentage> ] )"
     }
   }
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-overflow.json packages/css/css-overflow.json
--- webref/node_modules/@webref/css/css-overflow.json
+++ packages/css/css-overflow.json
@@ -214,6 +214,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-overscroll.json packages/css/css-overscroll.json
--- webref/node_modules/@webref/css/css-overscroll.json
+++ packages/css/css-overscroll.json
@@ -85,6 +85,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-page-floats.json packages/css/css-page-floats.json
--- webref/node_modules/@webref/css/css-page-floats.json
+++ packages/css/css-page-floats.json
@@ -78,7 +78,7 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<snap-block()>": {
       "value": "snap-block( <length> , [ start | end | near ]? )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-page.json packages/css/css-page.json
--- webref/node_modules/@webref/css/css-page.json
+++ packages/css/css-page.json
@@ -19,43 +19,104 @@
       ]
     }
   },
-  "descriptors": {
-    "size": [
-      {
-        "name": "size",
-        "for": "@page",
-        "value": "<length>{1,2} | auto | [ <page-size> || [ portrait | landscape ] ]",
-        "initial": "auto",
-        "computedValue": "specified value, with <length>s made absolute."
-      }
-    ],
-    "page-orientation": [
-      {
-        "name": "page-orientation",
-        "for": "@page",
-        "value": "upright | rotate-left | rotate-right",
-        "initial": "upright",
-        "computedValue": "as specified"
-      }
-    ],
-    "marks": [
-      {
-        "name": "marks",
-        "for": "@page",
-        "value": "none | [ crop || cross ]",
-        "initial": "none",
-        "computedValue": "as specified"
-      }
-    ],
-    "bleed": [
-      {
-        "name": "bleed",
-        "for": "@page",
-        "value": "auto | <length>",
-        "initial": "auto",
-        "computedValue": "as specified"
-      }
-    ]
+  "atrules": {
+    "@page": {
+      "value": "@page <page-selector-list>? { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "size",
+          "for": "@page",
+          "value": "<length>{1,2} | auto | [ <page-size> || [ portrait | landscape ] ]",
+          "initial": "auto",
+          "computedValue": "specified value, with <length>s made absolute."
+        },
+        {
+          "name": "page-orientation",
+          "for": "@page",
+          "value": "upright | rotate-left | rotate-right",
+          "initial": "upright",
+          "computedValue": "as specified"
+        },
+        {
+          "name": "marks",
+          "for": "@page",
+          "value": "none | [ crop || cross ]",
+          "initial": "none",
+          "computedValue": "as specified"
+        },
+        {
+          "name": "bleed",
+          "for": "@page",
+          "value": "auto | <length>",
+          "initial": "auto",
+          "computedValue": "as specified"
+        }
+      ]
+    },
+    "@top-left-corner": {
+      "value": "@top-left-corner { <declaration-list> };",
+      "descriptors": []
+    },
+    "@top-left": {
+      "value": "@top-left { <declaration-list> };",
+      "descriptors": []
+    },
+    "@top-center": {
+      "value": "@top-center { <declaration-list> };",
+      "descriptors": []
+    },
+    "@top-right": {
+      "value": "@top-right { <declaration-list> };",
+      "descriptors": []
+    },
+    "@top-right-corner": {
+      "value": "@top-right-corner { <declaration-list> };",
+      "descriptors": []
+    },
+    "@bottom-left-corner": {
+      "value": "@bottom-left-corner { <declaration-list> };",
+      "descriptors": []
+    },
+    "@bottom-left": {
+      "value": "@bottom-left { <declaration-list> };",
+      "descriptors": []
+    },
+    "@bottom-center": {
+      "value": "@bottom-center { <declaration-list> };",
+      "descriptors": []
+    },
+    "@bottom-right": {
+      "value": "@bottom-right { <declaration-list> };",
+      "descriptors": []
+    },
+    "@bottom-right-corner": {
+      "value": "@bottom-right-corner { <declaration-list> };",
+      "descriptors": []
+    },
+    "@left-top": {
+      "value": "@left-top { <declaration-list> };",
+      "descriptors": []
+    },
+    "@left-middle": {
+      "value": "@left-middle { <declaration-list> };",
+      "descriptors": []
+    },
+    "@left-bottom": {
+      "value": "@left-bottom { <declaration-list> };",
+      "descriptors": []
+    },
+    "@right-top": {
+      "value": "@right-top { <declaration-list> };",
+      "descriptors": []
+    },
+    "@right-middle": {
+      "value": "@right-middle { <declaration-list> };",
+      "descriptors": []
+    },
+    "@right-bottom": {
+      "value": "@right-bottom { <declaration-list> };",
+      "descriptors": []
+    }
   },
   "valuespaces": {
     "<page-size>": {

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-paint-api.json packages/css/css-paint-api.json
--- webref/node_modules/@webref/css/css-paint-api.json
+++ packages/css/css-paint-api.json
@@ -4,7 +4,7 @@
     "url": "https://drafts.css-houdini.org/css-paint-api-1/"
   },
   "properties": {},
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {
     "<paint()>": {
       "value": "paint( <ident>, <declaration-value>? )"

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-position.json packages/css/css-position.json
--- webref/node_modules/@webref/css/css-position.json
+++ packages/css/css-position.json
@@ -180,6 +180,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-properties-values-api.json packages/css/css-properties-values-api.json
--- webref/node_modules/@webref/css/css-properties-values-api.json
+++ packages/css/css-properties-values-api.json
@@ -4,31 +4,30 @@
     "url": "https://drafts.css-houdini.org/css-properties-values-api-1/"
   },
   "properties": {},
-  "descriptors": {
-    "syntax": [
-      {
-        "name": "syntax",
-        "for": "@property",
-        "value": "<string>",
-        "initial": "n/a (see prose)"
-      }
-    ],
-    "inherits": [
-      {
-        "name": "inherits",
-        "for": "@property",
-        "value": "true | false",
-        "initial": "n/a (see prose)"
-      }
-    ],
-    "initial-value": [
-      {
-        "name": "initial-value",
-        "for": "@property",
-        "value": "<declaration-value>",
-        "initial": "the guaranteed-invalid value (but see prose)"
-      }
-    ]
+  "atrules": {
+    "@property": {
+      "value": "@property <custom-property-name> { <declaration-list> }",
+      "descriptors": [
+        {
+          "name": "syntax",
+          "for": "@property",
+          "value": "<string>",
+          "initial": "n/a (see prose)"
+        },
+        {
+          "name": "inherits",
+          "for": "@property",
+          "value": "true | false",
+          "initial": "n/a (see prose)"
+        },
+        {
+          "name": "initial-value",
+          "for": "@property",
+          "value": "<declaration-value>",
+          "initial": "the guaranteed-invalid value (but see prose)"
+        }
+      ]
+    }
   },
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-regions.json packages/css/css-regions.json
--- webref/node_modules/@webref/css/css-regions.json
+++ packages/css/css-regions.json
@@ -50,6 +50,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-rhythm.json packages/css/css-rhythm.json
--- webref/node_modules/@webref/css/css-rhythm.json
+++ packages/css/css-rhythm.json
@@ -100,6 +100,6 @@
       ]
     }
   },
-  "descriptors": {},
+  "atrules": {},
   "valuespaces": {}
 }

diff --ignore-trailing-space '--exclude=package.json' '--exclude=README.md' '--unified=3' webref/node_modules/@webref/css/css-round-display.json packages/css/css-round-display.json
--- webref/node_modules/@webref/css/css-round-display.json
+++ packages/css/css-round-display.json
@@ -20,25 +20,29 @@
       ]
     }
   },
-  "descriptors": {
-    "shape": [
-      {
-        "name": "shape",
-        "for": "@media",
-        "value": "rect | round",
-        "type": "discrete"
-      }
-    ],
-    "viewport-fit": [
-      {
-        "name": "viewport-fit",
-        "for": "@viewport",
-        "value": "auto | contain | cover",
-        "initial": "auto",
-        "percentages": "N/A",
-        "computedValue": "as specified"
-      }
-    ]
+  "atrules": {
+    "@media": {
+      "descriptors": [
+        {
+          "name": "shape",
+          "for": "@media",
+          "value": "rect | round",
+          "type": "discrete"
+        }
+      ]
+    },
+    "@viewport": {
+      "descriptors": [
+     

[dontcallmedom]

I took a look at the full diff in the action log which LGTM

[dontcallmedom]

the latest update hit a weird bug whereby https://drafts.csswg.org/css-speech-1/ is not correctly generated and no longer has a detected title. not sure whether we should block on this though

[foolip]

What's the change that caused a major version bump? Not sure what I should be looking for in foolip/mdn-bcd-collector#2244 :)

[dontcallmedom]

reffy now extracts atrules and associates descriptors to them w3c/reffy#1033

[foolip]

Great, that's what I saw in the diff, but I wondered if there might be more.