css-variables.json

{
  "spec": {
    "title": "CSS Custom Properties for Cascading Variables Module Level 2",
    "url": "https://drafts.csswg.org/css-variables-2/"
  },
  "properties": [],
  "atrules": [],
  "selectors": [],
  "values": [
    {
      "name": "<custom-property-name>",
      "prose": "A custom property is any property whose name starts with two dashes (U+002D HYPHEN-MINUS), like --foo. The <custom-property-name> production corresponds to this: it’s defined as any <dashed-ident> (a valid identifier that starts with two dashes), except -- itself, which is reserved for future use by CSS. Custom properties are solely for use by authors and users; CSS will never give them a meaning beyond what is presented here.",
      "href": "https://drafts.csswg.org/css-variables-2/#typedef-custom-property-name",
      "type": "type"
    },
    {
      "name": "var()",
      "href": "https://drafts.csswg.org/css-variables-2/#funcdef-var",
      "type": "function",
      "value": "var( <custom-property-name> , <declaration-value>? )"
    }
  ]
}