Test: MDN data for CSS language service

[octref]

• linux @alexandrudima
• windows @gregvanl

Complexity: 2

Ref: microsoft/vscode-css-languageservice#68

CSS properties has been added to css language service to enhance various language features.

A list of added properties

{
  "experimental": [
    "appearance",
    "backdrop-filter",
    "font-variation-settings",
    "initial-letter",
    "initial-letter-align",
    "line-height-step",
    "mask-border",
    "mask-border-mode",
    "mask-border-outset",
    "mask-border-repeat",
    "mask-border-slice",
    "mask-border-source",
    "mask-border-width",
    "offset",
    "offset-anchor",
    "offset-distance",
    "offset-path",
    "offset-position",
    "offset-rotate",
    "text-decoration-skip",
    "text-decoration-skip-ink",
    "text-size-adjust"
  ],
  "nonstandard": [
    "-moz-binding",
    "-moz-context-properties",
    "-moz-float-edge",
    "-moz-force-broken-image-icon",
    "-moz-image-region",
    "-moz-orient",
    "-moz-outline-radius",
    "-moz-outline-radius-bottomleft",
    "-moz-outline-radius-bottomright",
    "-moz-outline-radius-topleft",
    "-moz-outline-radius-topright",
    "-moz-stack-sizing",
    "-moz-text-blink",
    "-moz-user-input",
    "-moz-user-modify",
    "-moz-window-dragging",
    "-moz-window-shadow",
    "-webkit-border-before",
    "-webkit-border-before-color",
    "-webkit-border-before-style",
    "-webkit-border-before-width",
    "-webkit-mask",
    "-webkit-mask-attachment",
    "-webkit-mask-composite",
    "-webkit-mask-position",
    "-webkit-mask-position-x",
    "-webkit-mask-position-y",
    "-webkit-mask-repeat-x",
    "-webkit-mask-repeat-y",
    "box-align",
    "box-direction",
    "box-flex",
    "box-flex-group",
    "box-lines",
    "box-ordinal-group",
    "box-orient",
    "box-pack",
    "overflow-clip-box",
    "overscroll-behavior",
    "overscroll-behavior-x",
    "overscroll-behavior-y",
    "scroll-snap-type-x",
    "scroll-snap-type-y"
  ],
  "obsolete": [],
  "standard": [
    "gap",
    "hanging-punctuation",
    "image-resolution",
    "mask",
    "mask-clip",
    "mask-composite",
    "place-content",
    "rotate",
    "row-gap",
    "ruby-merge",
    "scale",
    "text-combine-upright",
    "text-emphasis",
    "text-emphasis-color",
    "text-emphasis-position",
    "text-emphasis-style",
    "transform-box",
    "translate"
  ]
}

---

Please verify:

• Properties from each group are showing up in css/scss/less
• experimental, obsolete and nonstandard properties show warning in their documentation and the display is fine.
• Unknown properties are now resolved and not outputting errors, for example:
  • overscroll-behavior: [css] Unknown property: 'overscroll-behavior' #46866
  • font-display: [css] Add support for 'font-display' CSS property #46423
  • backdrop-filter: [css] add backdrop-filter (experimental) #27204
• No value auto completion for these properties yet so it shows inherit, initial and unset. This is a known limitation.