{
  "api": {
    "CustomElementRegistry": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry",
        "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-api",
        "tags": [
          "web-features:autonomous-custom-elements"
        ],
        "support": {
          "chrome": {
            "version_added": "54"
          },
          "chrome_android": "mirror",
          "edge": "mirror",
          "firefox": {
            "version_added": "63"
          },
          "firefox_android": "mirror",
          "oculus": "mirror",
          "opera": "mirror",
          "opera_android": "mirror",
          "safari": {
            "version_added": "10.1"
          },
          "safari_ios": "mirror",
          "samsunginternet_android": "mirror",
          "webview_android": "mirror",
          "webview_ios": "mirror"
        },
        "status": {
          "experimental": false,
          "standard_track": true,
          "deprecated": false
        }
      },
      "CustomElementRegistry": {
        "__compat": {
          "description": "`CustomElementRegistry()` constructor",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/CustomElementRegistry",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry",
          "tags": [
            "web-features:scoped-custom-element-registries"
          ],
          "support": {
            "chrome": {
              "version_added": "146"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "26"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "builtin_element_support": {
        "__compat": {
          "description": "Customized built-in element support",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/define#defining_a_customized_built-in_element",
          "tags": [
            "web-features:customized-built-in-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "67"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": false,
              "impl_url": "https://webkit.org/b/182671"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "define": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/define",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-define-dev",
          "tags": [
            "web-features:autonomous-custom-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "54"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "connectedMoveCallback_lifecycle_callback": {
          "__compat": {
            "description": "`connectedMoveCallback()` lifecycle callback",
            "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#preserving-custom-element-state-when-moved",
            "tags": [
              "web-features:move-before"
            ],
            "support": {
              "chrome": {
                "version_added": "133"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "144"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "disabledFeatures_static_property": {
          "__compat": {
            "description": "Supports `disabledFeatures` static property",
            "tags": [
              "web-features:autonomous-custom-elements"
            ],
            "support": {
              "chrome": {
                "version_added": "77"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "92"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "html_name_validity": {
          "__compat": {
            "description": "Emoji and more Unicode in element and attribute names and namespace prefix (valid names match HTML parser)",
            "spec_url": "https://dom.spec.whatwg.org/#namespaces",
            "support": {
              "chrome": {
                "version_added": "143"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "149"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "get": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/get",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-get-dev",
          "tags": [
            "web-features:autonomous-custom-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "54"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10.1",
              "partial_implementation": true,
              "notes": "Supports 'Autonomous custom elements' but not 'Customized built-in elements'. See [bug 182671](https://webkit.org/b/182671)."
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getName": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/getName",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-getname",
          "tags": [
            "web-features:autonomous-custom-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "117"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "116"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "17",
              "partial_implementation": true,
              "notes": "Supports 'Autonomous custom elements' but not 'Customized built-in elements'."
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "initialize": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/initialize",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-initialize",
          "tags": [
            "web-features:scoped-custom-element-registries"
          ],
          "support": {
            "chrome": {
              "version_added": "146"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "26"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "upgrade": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/upgrade",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade-dev",
          "tags": [
            "web-features:autonomous-custom-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "68"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "12.1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "whenDefined": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CustomElementRegistry/whenDefined",
          "spec_url": "https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-whendefined-dev",
          "tags": [
            "web-features:autonomous-custom-elements"
          ],
          "support": {
            "chrome": {
              "version_added": "54"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "html_name_validity": {
          "__compat": {
            "description": "Emoji and more Unicode in element and attribute names and namespace prefix (valid names match HTML parser)",
            "spec_url": "https://dom.spec.whatwg.org/#namespaces",
            "support": {
              "chrome": {
                "version_added": "143"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "149"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}