webextensions/api/dom.json

{
  "webextensions": {
    "api": {
      "dom": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/dom",
          "support": {
            "chrome": {
              "version_added": "88"
            },
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "opera": "mirror",
            "safari": {
              "version_added": false
            },
            "safari_ios": "mirror"
          }
        },
        "openOrClosedShadowRoot": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/dom/openOrClosedShadowRoot",
            "support": {
              "chrome": {
                "version_added": "88"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": false,
                "notes": "Use <code>element.openOrClosedShadowRoot</code>, available since Firefox 63."
              },
              "firefox_android": "mirror",
              "opera": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror"
            }
          }
        }
      }
    }
  }
}