{
  "api": {
    "FontFaceSet": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet",
        "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
        "tags": [
          "web-features:font-loading"
        ],
        "support": {
          "chrome": {
            "version_added": "35",
            "notes": "Chrome does not expose the `FontFaceSet` interface directly, and is only available through [`Document.fonts`](https://developer.mozilla.org/docs/Web/API/Document/fonts) or [`WorkerGlobalScope.fonts`](https://developer.mozilla.org/docs/Web/API/WorkerGlobalScope/fonts)."
          },
          "chrome_android": "mirror",
          "edge": "mirror",
          "firefox": {
            "version_added": "41"
          },
          "firefox_android": "mirror",
          "oculus": "mirror",
          "opera": "mirror",
          "opera_android": "mirror",
          "safari": {
            "version_added": "10"
          },
          "safari_ios": "mirror",
          "samsunginternet_android": "mirror",
          "webview_android": "mirror",
          "webview_ios": "mirror"
        },
        "status": {
          "experimental": false,
          "standard_track": true,
          "deprecated": false
        }
      },
      "FontFaceSet": {
        "__compat": {
          "description": "`FontFaceSet()` constructor",
          "support": {
            "chrome": {
              "version_added": false,
              "impl_url": "https://crbug.com/40287940"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10",
              "version_removed": "26.4"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": false,
            "deprecated": true
          }
        }
      },
      "worker_support": {
        "__compat": {
          "description": "Available in workers",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "69"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "105"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "15"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "add": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/add",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-add",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "check": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/check",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-check",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "120"
              },
              {
                "version_added": "35",
                "version_removed": "120",
                "partial_implementation": true,
                "notes": "Prior to version 120, this method returned `false` instead of `true` for nonexistent or locally installed fonts. See [bug 40893726](https://crbug.com/40893726)."
              }
            ],
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "clear": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/clear",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-clear",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "delete": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/delete",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-delete",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "entries": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/entries",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "48"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41",
              "partial_implementation": true,
              "notes": "The returned iterator object has a `next()` method but does not implement `Symbol.iterator`, so it cannot be used with `for...of` or spread syntax. See [bug 1311198](https://bugzil.la/1311198)."
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "forEach": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/forEach",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "has": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/has",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "keys": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/keys",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "48"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41",
              "partial_implementation": true,
              "notes": "The returned iterator object has a `next()` method but does not implement `Symbol.iterator`, so it cannot be used with `for...of` or spread syntax. See [bug 1311198](https://bugzil.la/1311198)."
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "load": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/load",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-load",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "loading_event": {
        "__compat": {
          "description": "`loading` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/loading_event",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-onloading",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": [
              {
                "version_added": "26.2"
              },
              {
                "version_added": "10",
                "version_removed": "26.2",
                "partial_implementation": true,
                "notes": "The `onloading` event handler is supported, but the event never fires. See [bug 304091](https://webkit.org/b/304091)."
              }
            ],
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "loadingdone_event": {
        "__compat": {
          "description": "`loadingdone` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingdone_event",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-onloadingdone",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10",
              "partial_implementation": true,
              "notes": "The `onloadingdone` event handler is supported, but the event never fires. See [bug 304091](https://webkit.org/b/304091)."
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "loadingerror_event": {
        "__compat": {
          "description": "`loadingerror` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/loadingerror_event",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-onloadingerror",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10",
              "partial_implementation": true,
              "notes": "The `onloadingerror` event handler is supported, but the event never fires. See [bug 304091](https://webkit.org/b/304091)."
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "ready": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/ready",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-ready",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "size": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/size",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "status": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/status",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-status",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "35"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "values": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/FontFaceSet/values",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "48"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41",
              "partial_implementation": true,
              "notes": "The returned iterator object has a `next()` method but does not implement `Symbol.iterator`, so it cannot be used with `for...of` or spread syntax. See [bug 1311198](https://bugzil.la/1311198)."
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "@@iterator": {
        "__compat": {
          "description": "[Symbol.iterator]",
          "spec_url": "https://drafts.csswg.org/css-font-loading/#fontfaceset",
          "tags": [
            "web-features:font-loading"
          ],
          "support": {
            "chrome": {
              "version_added": "48"
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "41"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "10"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      }
    }
  }
}