{
  "javascript": {
    "builtins": {
      "Symbol": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol",
          "spec_url": "https://tc39.github.io/ecma262/#sec-symbol-objects",
          "support": {
            "chrome": {
              "version_added": "38"
            },
            "chrome_android": {
              "version_added": "38"
            },
            "edge": {
              "version_added": "12",
              "notes": "Edge 12 included Symbol properties in <code>JSON.stringify()</code> output."
            },
            "edge_mobile": {
              "version_added": true
            },
            "firefox": {
              "version_added": "36"
            },
            "firefox_android": {
              "version_added": "36"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": true
            },
            "opera": {
              "version_added": "25"
            },
            "opera_android": {
              "version_added": "25"
            },
            "safari": {
              "version_added": "9"
            },
            "safari_ios": {
              "version_added": "9"
            },
            "samsunginternet_android": {
              "version_added": true
            },
            "webview_android": {
              "version_added": "38"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "asyncIterator": {
          "__compat": {
            "support": {
              "chrome": {
                "version_added": "63"
              },
              "chrome_android": {
                "version_added": "63"
              },
              "edge": {
                "version_added": false
              },
              "edge_mobile": {
                "version_added": false
              },
              "firefox": {
                "version_added": false,
                "notes": "Available in Firefox Nightly."
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "63"
              }
            },
            "status": {
              "experimental": true,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "description": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/description",
            "spec_url": "https://tc39.github.io/proposal-Symbol-description/#sec-symbol.prototype.description",
            "support": {
              "chrome": {
                "version_added": "70"
              },
              "chrome_android": {
                "version_added": "70"
              },
              "edge": {
                "version_added": false
              },
              "edge_mobile": {
                "version_added": false
              },
              "firefox": {
                "version_added": "63"
              },
              "firefox_android": {
                "version_added": "63"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "opera": {
                "version_added": "57"
              },
              "opera_android": {
                "version_added": "57"
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": "70"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "for": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/for",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.for",
            "support": {
              "chrome": {
                "version_added": "40"
              },
              "chrome_android": {
                "version_added": "40"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": true
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "40"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "hasInstance": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.hasinstance",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "edge": {
                "version_added": "15"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "50"
              },
              "firefox_android": {
                "version_added": "50"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": [
                {
                  "version_added": "6.5.0"
                },
                {
                  "version_added": "6.0.0",
                  "flags": [
                    {
                      "type": "runtime_flag",
                      "name": "--harmony"
                    }
                  ]
                }
              ],
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "isConcatSpreadable": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.isconcatspreadable",
            "support": {
              "chrome": {
                "version_added": "48"
              },
              "chrome_android": {
                "version_added": "48"
              },
              "edge": {
                "version_added": "15"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "48"
              },
              "firefox_android": {
                "version_added": "48"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "48"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "iterator": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.iterator",
            "support": {
              "chrome": {
                "version_added": "43"
              },
              "chrome_android": {
                "version_added": "43"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12"
              },
              "opera": {
                "version_added": "30"
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "43"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "keyFor": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/keyFor",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.keyfor",
            "support": {
              "chrome": {
                "version_added": "40"
              },
              "chrome_android": {
                "version_added": "40"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": true
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "40"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "match": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/match",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.match",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "40"
              },
              "firefox_android": {
                "version_added": "40"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "matchAll": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/matchAll",
            "spec_url": "https://tc39.github.io/proposal-string-matchall/#Symbol.matchAll",
            "support": {
              "chrome": {
                "version_added": "73"
              },
              "chrome_android": {
                "version_added": "73"
              },
              "edge": {
                "version_added": false
              },
              "edge_mobile": {
                "version_added": false
              },
              "firefox": {
                "version_added": false
              },
              "firefox_android": {
                "version_added": false
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "opera": {
                "version_added": "60"
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "73"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "prototype": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/prototype",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.prototype",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": {
                "version_added": "38"
              },
              "edge": {
                "version_added": "12"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": true
              },
              "opera": {
                "version_added": "25"
              },
              "opera_android": {
                "version_added": "25"
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "38"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "replace": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/replace",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.replace",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "49"
              },
              "firefox_android": {
                "version_added": "49"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "search": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/search",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.search",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "49"
              },
              "firefox_android": {
                "version_added": "49"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "species": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/species",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.species",
            "support": {
              "chrome": {
                "version_added": "51"
              },
              "chrome_android": {
                "version_added": "51"
              },
              "edge": {
                "version_added": "14"
              },
              "edge_mobile": {
                "version_added": "14"
              },
              "firefox": {
                "version_added": "41"
              },
              "firefox_android": {
                "version_added": "41"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": [
                {
                  "version_added": "6.5.0"
                },
                {
                  "version_added": "6.0.0",
                  "flags": [
                    {
                      "type": "runtime_flag",
                      "name": "--harmony"
                    }
                  ]
                }
              ],
              "opera": {
                "version_added": "38"
              },
              "opera_android": {
                "version_added": "38"
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "51"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "split": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.split",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "49"
              },
              "firefox_android": {
                "version_added": "49"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "toPrimitive": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.toprimitive",
            "support": {
              "chrome": {
                "version_added": "47"
              },
              "chrome_android": {
                "version_added": "47"
              },
              "edge": {
                "version_added": "15"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "44"
              },
              "firefox_android": {
                "version_added": "44"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "47"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "toSource": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toSource",
            "support": {
              "chrome": {
                "version_added": false
              },
              "chrome_android": {
                "version_added": false
              },
              "edge": {
                "version_added": false
              },
              "edge_mobile": {
                "version_added": false
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": false
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": false
              }
            },
            "status": {
              "experimental": false,
              "standard_track": false,
              "deprecated": false
            }
          }
        },
        "toString": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toString",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.prototype.tostring",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": {
                "version_added": "38"
              },
              "edge": {
                "version_added": "12"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": true
              },
              "opera": {
                "version_added": "25"
              },
              "opera_android": {
                "version_added": "25"
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "38"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "toStringTag": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.tostringtag",
            "support": {
              "chrome": {
                "version_added": "49"
              },
              "chrome_android": {
                "version_added": "49"
              },
              "edge": {
                "version_added": "15"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "51"
              },
              "firefox_android": {
                "version_added": "51"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": [
                {
                  "version_added": "6.0.0"
                },
                {
                  "version_added": "4.0.0",
                  "flags": [
                    {
                      "type": "runtime_flag",
                      "name": "--harmony"
                    }
                  ]
                }
              ],
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": true
              },
              "safari_ios": {
                "version_added": true
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "49"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "unscopables": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/unscopables",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.unscopables",
            "support": {
              "chrome": {
                "version_added": "45"
              },
              "chrome_android": {
                "version_added": "45"
              },
              "edge": {
                "version_added": true
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "48"
              },
              "firefox_android": {
                "version_added": "48"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "0.12"
              },
              "opera": {
                "version_added": true
              },
              "opera_android": {
                "version_added": true
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "45"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "valueOf": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/valueOf",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.prototype.valueof",
            "support": {
              "chrome": {
                "version_added": "38"
              },
              "chrome_android": {
                "version_added": "38"
              },
              "edge": {
                "version_added": "12"
              },
              "edge_mobile": {
                "version_added": true
              },
              "firefox": {
                "version_added": "36"
              },
              "firefox_android": {
                "version_added": "36"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": true
              },
              "opera": {
                "version_added": "25"
              },
              "opera_android": {
                "version_added": "25"
              },
              "safari": {
                "version_added": "9"
              },
              "safari_ios": {
                "version_added": "9"
              },
              "samsunginternet_android": {
                "version_added": true
              },
              "webview_android": {
                "version_added": "38"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "@@toPrimitive": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol/@@toPrimitive",
            "spec_url": "https://tc39.github.io/ecma262/#sec-symbol.prototype-@@toprimitive",
            "support": {
              "chrome": {
                "version_added": null
              },
              "chrome_android": {
                "version_added": null
              },
              "edge": {
                "version_added": null
              },
              "edge_mobile": {
                "version_added": null
              },
              "firefox": {
                "version_added": "44"
              },
              "firefox_android": {
                "version_added": "44"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": null
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": null
              },
              "webview_android": {
                "version_added": null
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}