{
  "Type selectors": {
    "syntax": "element",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Type_selectors"
  },
  "Class selectors": {
    "syntax": ".class",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Class_selectors"
  },
  "ID selectors": {
    "syntax": "#id",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/ID_selectors"
  },
  "Universal selectors": {
    "syntax": "*",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Universal_selectors"
  },
  "Attribute selectors": {
    "syntax": "[attr=value]",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Attribute_selectors"
  },
  "Nesting selector": {
    "syntax": "A { &B { } }",
    "groups": [
      "CSS Nesting"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Nesting_selector"
  },
  "Selector list": {
    "syntax": ",",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Selector_list"
  },
  "Next-sibling combinator": {
    "syntax": "A + B",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Next-sibling_combinator"
  },
  "Subsequent-sibling combinator": {
    "syntax": "A ~ B",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Subsequent-sibling_combinator"
  },
  "Child combinator": {
    "syntax": "A > B",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Child_combinator"
  },
  "Descendant combinator": {
    "syntax": "A B",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Descendant_combinator"
  },
  "Column combinator": {
    "syntax": "A || B",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Column_combinator"
  },
  "Namespace separator": {
    "syntax": "A | B",
    "groups": [
      "CSS Namespaces"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Namespace_separator"
  },
  "Pseudo-classes": {
    "syntax": ":",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Pseudo-classes"
  },
  "Pseudo-elements": {
    "syntax": "::",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Pseudo-elements"
  },
  ":active": {
    "syntax": ":active",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:active"
  },
  ":active-view-transition": {
    "syntax": ":active-view-transition",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard"
  },
  ":active-view-transition-type()": {
    "syntax": ":active-view-transition-type( <custom-ident># )",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard"
  },
  ":any-link": {
    "syntax": ":any-link",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:any-link"
  },
  ":autofill": {
    "syntax": ":autofill",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:autofill"
  },
  ":blank": {
    "syntax": ":blank",
    "groups": [
      "CSS Paged Media"
    ],
    "status": "experimental",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:blank"
  },
  ":buffering": {
    "syntax": ":buffering",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:buffering"
  },
  ":checked": {
    "syntax": ":checked",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:checked"
  },
  ":current": {
    "syntax": ":current",
    "groups": [
      "Selectors"
    ],
    "status": "experimental",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:current"
  },
  ":default": {
    "syntax": ":default",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:default"
  },
  ":defined": {
    "syntax": ":defined",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:defined"
  },
  ":dir()": {
    "syntax": ":dir( [ ltr | rtl ] )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:dir"
  },
  ":disabled": {
    "syntax": ":disabled",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:disabled"
  },
  ":empty": {
    "syntax": ":empty",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:empty"
  },
  ":enabled": {
    "syntax": ":enabled",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:enabled"
  },
  ":first": {
    "syntax": ":first",
    "groups": [
      "CSS Paged Media"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:first"
  },
  ":first-child": {
    "syntax": ":first-child",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:first-child"
  },
  ":first-of-type": {
    "syntax": ":first-of-type",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:first-of-type"
  },
  ":focus": {
    "syntax": ":focus",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:focus"
  },
  ":focus-visible": {
    "syntax": ":focus-visible",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:focus-visible"
  },
  ":focus-within": {
    "syntax": ":focus-within",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:focus-within"
  },
  ":fullscreen": {
    "syntax": ":fullscreen",
    "groups": [
      "Selectors",
      "Fullscreen API"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:fullscreen"
  },
  ":future": {
    "syntax": ":future",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:future"
  },
  ":has()": {
    "syntax": ":has( <forgiving-relative-selector-list> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:has"
  },
  ":has-slotted": {
    "syntax": ":has-slotted",
    "groups": [
      "CSS Scoping"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:has-slotted"
  },
  ":host": {
    "syntax": ":host",
    "groups": [
      "CSS Scoping"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:host"
  },
  ":host()": {
    "syntax": ":host( <compound-selector> )",
    "groups": [
      "CSS Scoping"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:host_function"
  },
  ":host-context()": {
    "syntax": ":host-context( <compound-selector> )",
    "groups": [
      "CSS Scoping"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:host-context"
  },
  ":hover": {
    "syntax": ":hover",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:hover"
  },
  ":in-range": {
    "syntax": ":in-range",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:in-range"
  },
  ":indeterminate": {
    "syntax": ":indeterminate",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:indeterminate"
  },
  ":invalid": {
    "syntax": ":invalid",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:invalid"
  },
  ":is()": {
    "syntax": ":is( <forgiving-selector-list> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:is"
  },
  ":lang()": {
    "syntax": ":lang( <language-code> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:lang"
  },
  ":last-child": {
    "syntax": ":last-child",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:last-child"
  },
  ":last-of-type": {
    "syntax": ":last-of-type",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:last-of-type"
  },
  ":left": {
    "syntax": ":left",
    "groups": [
      "CSS Paged Media"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:left"
  },
  ":link": {
    "syntax": ":link",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:link"
  },
  ":local-link": {
    "syntax": ":local-link",
    "groups": [
      "Selectors"
    ],
    "status": "experimental",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:local-link"
  },
  ":modal": {
    "syntax": ":modal",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:modal"
  },
  ":muted": {
    "syntax": ":muted",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:muted"
  },
  ":not()": {
    "syntax": ":not( <complex-selector-list> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:not"
  },
  ":nth-child()": {
    "syntax": ":nth-child( <an+b> [ of <complex-selector-list> ]? )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:nth-child"
  },
  ":nth-last-child()": {
    "syntax": ":nth-last-child( <an+b> [ of <complex-selector-list> ]? )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:nth-last-child"
  },
  ":nth-last-of-type()": {
    "syntax": ":nth-last-of-type( <an+b> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:nth-last-of-type"
  },
  ":nth-of-type()": {
    "syntax": ":nth-of-type( <an+b> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:nth-of-type"
  },
  ":only-child": {
    "syntax": ":only-child",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:only-child"
  },
  ":only-of-type": {
    "syntax": ":only-of-type",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:only-of-type"
  },
  ":open": {
    "syntax": ":open",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:open"
  },
  ":optional": {
    "syntax": ":optional",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:optional"
  },
  ":out-of-range": {
    "syntax": ":out-of-range",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:out-of-range"
  },
  ":past": {
    "syntax": ":past",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:past"
  },
  ":paused": {
    "syntax": ":paused",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:paused"
  },
  ":picture-in-picture": {
    "syntax": ":picture-in-picture",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:picture-in-picture"
  },
  ":placeholder-shown": {
    "syntax": ":placeholder-shown",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:placeholder-shown"
  },
  ":playing": {
    "syntax": ":playing",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:playing"
  },
  ":popover-open": {
    "syntax": ":popover-open",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:popover-open"
  },
  ":read-only": {
    "syntax": ":read-only",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:read-only"
  },
  ":read-write": {
    "syntax": ":read-write",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:read-write"
  },
  ":required": {
    "syntax": ":required",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:required"
  },
  ":right": {
    "syntax": ":right",
    "groups": [
      "CSS Paged Media"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:right"
  },
  ":root": {
    "syntax": ":root",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:root"
  },
  ":scope": {
    "syntax": ":scope",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:scope"
  },
  ":seeking": {
    "syntax": ":seeking",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:seeking"
  },
  ":stalled": {
    "syntax": ":stalled",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:stalled"
  },
  ":state()": {
    "syntax": ":state( <custom-ident> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:state"
  },
  ":target": {
    "syntax": ":target",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:target"
  },
  ":target-current": {
    "syntax": ":target-current",
    "groups": [
      "CSS Overflow"
    ],
    "status": "experimental"
  },
  ":target-within": {
    "syntax": ":target-within",
    "groups": [
      "Selectors"
    ],
    "status": "experimental",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:target-within"
  },
  ":user-invalid": {
    "syntax": ":user-invalid",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:user-invalid"
  },
  ":user-valid": {
    "syntax": ":user-valid",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:user-valid"
  },
  ":valid": {
    "syntax": ":valid",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:valid"
  },
  ":visited": {
    "syntax": ":visited",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:visited"
  },
  ":volume-locked": {
    "syntax": ":volume-locked",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:volume-locked"
  },
  ":where()": {
    "syntax": ":where( <complex-selector-list> )",
    "groups": [
      "Selectors"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:where"
  },
  ":xr-overlay": {
    "syntax": ":xr-overlay",
    "groups": [
      "WebXR DOM Overlays"
    ],
    "status": "experimental"
  },
  "::-ms-browse": {
    "syntax": "::-ms-browse",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-check": {
    "syntax": "::-ms-check",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-clear": {
    "syntax": "::-ms-clear",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-expand": {
    "syntax": "::-ms-expand",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-fill": {
    "syntax": "::-ms-fill",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-fill-lower": {
    "syntax": "::-ms-fill-lower",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-fill-upper": {
    "syntax": "::-ms-fill-upper",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-reveal": {
    "syntax": "::-ms-reveal",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-thumb": {
    "syntax": "::-ms-thumb",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-ticks-after": {
    "syntax": "::-ms-ticks-after",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-ticks-before": {
    "syntax": "::-ms-ticks-before",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-tooltip": {
    "syntax": "::-ms-tooltip",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-track": {
    "syntax": "::-ms-track",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-ms-value": {
    "syntax": "::-ms-value",
    "groups": [
      "Microsoft Extensions"
    ],
    "status": "nonstandard"
  },
  "::-moz-progress-bar": {
    "syntax": "::-moz-progress-bar",
    "groups": [
      "Mozilla Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-moz-progress-bar"
  },
  "::-moz-range-progress": {
    "syntax": "::-moz-range-progress",
    "groups": [
      "Mozilla Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-moz-range-progress"
  },
  "::-moz-range-thumb": {
    "syntax": "::-moz-range-thumb",
    "groups": [
      "Mozilla Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-moz-range-thumb"
  },
  "::-moz-range-track": {
    "syntax": "::-moz-range-track",
    "groups": [
      "Mozilla Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-moz-range-track"
  },
  "::-webkit-progress-bar": {
    "syntax": "::-webkit-progress-bar",
    "groups": [
      "WebKit Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-webkit-progress-bar"
  },
  "::-webkit-progress-inner-value": {
    "syntax": "::-webkit-progress-inner-value",
    "groups": [
      "WebKit Extensions"
    ],
    "status": "nonstandard"
  },
  "::-webkit-progress-value": {
    "syntax": "::-webkit-progress-value",
    "groups": [
      "WebKit Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-webkit-progress-value"
  },
  "::-webkit-slider-runnable-track": {
    "syntax": "::-webkit-slider-runnable-track",
    "groups": [
      "WebKit Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-webkit-slider-runnable-track"
  },
  "::-webkit-slider-thumb": {
    "syntax": "::-webkit-slider-thumb",
    "groups": [
      "WebKit Extensions"
    ],
    "status": "nonstandard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-webkit-slider-thumb"
  },
  "::after": {
    "syntax": "::after",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::after"
  },
  "::backdrop": {
    "syntax": "::backdrop",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::backdrop"
  },
  "::before": {
    "syntax": "::before",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::before"
  },
  "::checkmark": {
    "syntax": "::checkmark",
    "groups": [
      "CSS Form Control Styling"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::checkmark"
  },
  "::cue": {
    "syntax": "::cue",
    "groups": [
      "WebVTT"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::cue"
  },
  "::cue()": {
    "syntax": "::cue( <selector> )",
    "groups": [
      "WebVTT"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::cue"
  },
  "::cue-region": {
    "syntax": "::cue-region",
    "groups": [
      "WebVTT"
    ],
    "status": "experimental"
  },
  "::cue-region()": {
    "syntax": "::cue-region( <selector> )",
    "groups": [
      "WebVTT"
    ],
    "status": "experimental"
  },
  "::details-content": {
    "syntax": "::details-content",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::details-content"
  },
  "::file-selector-button": {
    "syntax": "::file-selector-button",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::file-selector-button"
  },
  "::first-letter": {
    "syntax": "::first-letter",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::first-letter"
  },
  "::first-line": {
    "syntax": "::first-line",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::first-line"
  },
  "::grammar-error": {
    "syntax": "::grammar-error",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::grammar-error"
  },
  "::highlight()": {
    "syntax": "::highlight( <custom-ident> )",
    "groups": [
      "CSS Pseudo-Elements",
      "CSS Custom Highlight API"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::highlight"
  },
  "::marker": {
    "syntax": "::marker",
    "groups": [
      "CSS Pseudo-Elements",
      "CSS Lists and Counters"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::marker"
  },
  "::part()": {
    "syntax": "::part( <ident>+ )",
    "groups": [
      "CSS Shadow Parts"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::part"
  },
  "::picker-icon": {
    "syntax": "::picker-icon",
    "groups": [
      "CSS Form Control Styling"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::picker-icon"
  },
  "::picker()": {
    "syntax": "::picker( <form-control-identifier>+ )",
    "groups": [
      "CSS Form Control Styling"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::picker"
  },
  "::placeholder": {
    "syntax": "::placeholder",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::placeholder"
  },
  "::scroll-marker": {
    "syntax": "::scroll-marker",
    "groups": [
      "CSS Overflow"
    ],
    "status": "experimental"
  },
  "::scroll-marker-group": {
    "syntax": "::scroll-marker-group",
    "groups": [
      "CSS Overflow"
    ],
    "status": "experimental"
  },
  "::selection": {
    "syntax": "::selection",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::selection"
  },
  "::slotted()": {
    "syntax": "::slotted( <compound-selector> )",
    "groups": [
      "CSS Scoping"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::slotted"
  },
  "::spelling-error": {
    "syntax": "::spelling-error",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::spelling-error"
  },
  "::target-text": {
    "syntax": "::target-text",
    "groups": [
      "CSS Pseudo-Elements"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::target-text"
  },
  "::view-transition": {
    "syntax": "::view-transition",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::view-transition"
  },
  "::view-transition-group()": {
    "syntax": "::view-transition-group([ '*' | <custom-ident> ])",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::view-transition-group"
  },
  "::view-transition-image-pair()": {
    "syntax": "::view-transition-image-pair([ '*' | <custom-ident> ])",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::view-transition-image-pair"
  },
  "::view-transition-new()": {
    "syntax": "::view-transition-new([ '*' | <custom-ident> ])",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::view-transition-new"
  },
  "::view-transition-old()": {
    "syntax": "::view-transition-old([ '*' | <custom-ident> ])",
    "groups": [
      "CSS View Transitions"
    ],
    "status": "standard",
    "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::view-transition-old"
  }
}
