css/at-rules/custom-media.json

{
  "css": {
    "at-rules": {
      "custom-media": {
        "__compat": {
          "description": "`@custom-media`",
          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Reference/At-rules/@custom-media",
          "spec_url": "https://drafts.csswg.org/mediaqueries-5/#at-ruledef-custom-media",
          "tags": [
            "web-features:custom-media-queries"
          ],
          "support": {
            "chrome": {
              "version_added": false,
              "impl_url": "https://crbug.com/40781325"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "148",
              "flags": [
                {
                  "type": "preference",
                  "name": "layout.css.custom-media.enabled",
                  "value_to_set": "true"
                }
              ]
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": false,
              "impl_url": "https://webkit.org/b/233820"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": true,
            "standard_track": true,
            "deprecated": false
          }
        }
      }
    }
  }
}