statements.json

{
  "javascript": {
    "statements": {
      "async_function": {
        "__compat": {
          "description": "<code>async function</code> statement",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/async_function",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-async-function-definitions",
          "support": {
            "chrome": {
              "version_added": "55"
            },
            "chrome_android": {
              "version_added": "55"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "15"
            },
            "firefox": {
              "version_added": "52"
            },
            "firefox_android": {
              "version_added": "52"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "7.6.0"
              },
              {
                "version_added": "7.0.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony"
                  }
                ]
              }
            ],
            "opera": {
              "version_added": "42"
            },
            "opera_android": {
              "version_added": "42"
            },
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": {
              "version_added": "10.3"
            },
            "samsunginternet_android": {
              "version_added": "6.0"
            },
            "webview_android": {
              "version_added": "55"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "async_generator_function": {
        "__compat": {
          "description": "<code>async function*</code> statement",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/async_function*",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-async-generator-function-definitions",
          "support": {
            "chrome": {
              "version_added": "63"
            },
            "chrome_android": {
              "version_added": "63"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "79"
            },
            "firefox": {
              "version_added": "55"
            },
            "firefox_android": {
              "version_added": "55"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "10.0.0"
              },
              {
                "version_added": "8.10.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony"
                  }
                ]
              }
            ],
            "opera": {
              "version_added": "50"
            },
            "opera_android": {
              "version_added": "46"
            },
            "safari": {
              "version_added": "12"
            },
            "safari_ios": {
              "version_added": "12"
            },
            "samsunginternet_android": {
              "version_added": "8.0"
            },
            "webview_android": {
              "version_added": "63"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "block": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/block",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-block",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "11"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "break": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/break",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-break-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "class": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/class",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-class-definitions",
          "support": {
            "chrome": [
              {
                "version_added": "49"
              },
              {
                "version_removed": "49",
                "version_added": "42",
                "notes": "Strict mode is required."
              },
              {
                "version_removed": "49",
                "version_added": "42",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental JavaScript",
                    "value_to_set": "Enabled"
                  }
                ]
              }
            ],
            "chrome_android": [
              {
                "version_added": "49"
              },
              {
                "version_removed": "49",
                "version_added": "42",
                "notes": "Strict mode is required."
              },
              {
                "version_removed": "49",
                "version_added": "42",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental JavaScript",
                    "value_to_set": "Enabled"
                  }
                ]
              }
            ],
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "13"
            },
            "firefox": {
              "version_added": "45"
            },
            "firefox_android": {
              "version_added": "45"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": "6.0.0"
            },
            "opera": [
              {
                "version_added": "36"
              },
              {
                "version_removed": "36",
                "version_added": "29",
                "notes": "Strict mode is required."
              },
              {
                "version_removed": "36",
                "version_added": "29",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental JavaScript",
                    "value_to_set": "Enabled"
                  }
                ]
              }
            ],
            "opera_android": [
              {
                "version_added": "36"
              },
              {
                "version_removed": "36",
                "version_added": "29",
                "notes": "Strict mode is required."
              },
              {
                "version_removed": "36",
                "version_added": "29",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental JavaScript",
                    "value_to_set": "Enabled"
                  }
                ]
              }
            ],
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": {
              "version_added": "10.3"
            },
            "samsunginternet_android": [
              {
                "version_added": "5.0"
              },
              {
                "version_removed": "5.0",
                "version_added": "4.0",
                "notes": "Strict mode is required."
              }
            ],
            "webview_android": [
              {
                "version_added": "49"
              },
              {
                "version_removed": "49",
                "version_added": "42",
                "notes": "Strict mode is required."
              }
            ]
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "const": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/const",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations",
          "support": {
            "chrome": {
              "version_added": "21"
            },
            "chrome_android": {
              "version_added": "25"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "36",
              "notes": [
                "Before Firefox 13, <code>const</code> is implemented, but re-assignment is not failing.",
                "Before Firefox 46, a <code>TypeError</code> was thrown on redeclaration instead of a <code>SyntaxError</code>."
              ]
            },
            "firefox_android": {
              "version_added": "36",
              "notes": [
                "Before Firefox 13, <code>const</code> is implemented, but re-assignment is not failing.",
                "Before Firefox 46, a <code>TypeError</code> was thrown on redeclaration instead of a <code>SyntaxError</code>."
              ]
            },
            "ie": {
              "version_added": "11"
            },
            "nodejs": {
              "version_added": "6.0.0"
            },
            "opera": {
              "version_added": "9"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "5.1"
            },
            "safari_ios": {
              "version_added": "6"
            },
            "samsunginternet_android": {
              "version_added": "1.5"
            },
            "webview_android": {
              "version_added": "≤37"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "continue": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/continue",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-continue-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "debugger": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/debugger",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-debugger-statement",
          "support": {
            "chrome": {
              "version_added": "5"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "4"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "10"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "5"
            },
            "safari_ios": {
              "version_added": "4.2"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "do_while": {
        "__compat": {
          "description": "<code>do...while</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/do...while",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-do-while-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "4"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "empty": {
        "__compat": {
          "description": "Empty statement (<code>;</code>)",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/Empty",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-empty-statement",
          "support": {
            "chrome": {
              "version_added": "3"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "5"
            },
            "safari_ios": {
              "version_added": "4.2"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "export": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
          "support": {
            "chrome": {
              "version_added": "61"
            },
            "chrome_android": {
              "version_added": "61"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "16"
            },
            "firefox": {
              "version_added": "60"
            },
            "firefox_android": {
              "version_added": "60"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "13.2.0",
                "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              },
              {
                "version_added": "12.0.0",
                "flags": [
                  {
                    "name": "--experimental-modules",
                    "type": "runtime_flag"
                  }
                ],
                "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/docs/latest-v12.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              },
              {
                "version_added": "8.5.0",
                "flags": [
                  {
                    "name": "--experimental-modules",
                    "type": "runtime_flag"
                  }
                ],
                "notes": "Module filenames must end with <code>.mjs</code>, not </code>.js</code>. See Node's <a href='https://nodejs.org/docs/latest-v8.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              }
            ],
            "opera": {
              "version_added": "48"
            },
            "opera_android": {
              "version_added": "45"
            },
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": {
              "version_added": "10.3"
            },
            "samsunginternet_android": {
              "version_added": "8.0"
            },
            "webview_android": {
              "version_added": "61"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "default": {
          "__compat": {
            "description": "<code>default</code> keyword with <code>export</code>",
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
            "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
            "support": {
              "chrome": {
                "version_added": "61"
              },
              "chrome_android": {
                "version_added": "61"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "16"
              },
              "firefox": {
                "version_added": "60"
              },
              "firefox_android": {
                "version_added": "60"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": [
                {
                  "version_added": "13.2.0",
                  "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
                },
                {
                  "version_added": "12.0.0",
                  "flags": [
                    {
                      "name": "--experimental-modules",
                      "type": "runtime_flag"
                    }
                  ],
                  "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/docs/latest-v12.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
                },
                {
                  "version_added": "8.5.0",
                  "flags": [
                    {
                      "name": "--experimental-modules",
                      "type": "runtime_flag"
                    }
                  ],
                  "notes": "Module filenames must end with <code>.mjs</code>, not </code>.js</code>. See Node's <a href='https://nodejs.org/docs/latest-v8.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
                }
              ],
              "opera": {
                "version_added": "48"
              },
              "opera_android": {
                "version_added": "45"
              },
              "safari": {
                "version_added": "10.1"
              },
              "safari_ios": {
                "version_added": "10.3"
              },
              "samsunginternet_android": {
                "version_added": "8.0"
              },
              "webview_android": {
                "version_added": false
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "namespace": {
          "__compat": {
            "description": "<code>export * as namespace</code>",
            "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export",
            "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-exports",
            "support": {
              "chrome": {
                "version_added": "72"
              },
              "chrome_android": {
                "version_added": "72"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "80"
              },
              "firefox_android": {
                "version_added": "80"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "12.0.0"
              },
              "opera": {
                "version_added": "60"
              },
              "opera_android": {
                "version_added": "51"
              },
              "safari": {
                "version_added": "14.1"
              },
              "safari_ios": {
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          "support": {
            "chrome": {
              "version_added": "1"
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              "version_added": "1"
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            "safari_ios": {
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            "standard_track": true,
            "deprecated": false
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          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for-await...of",
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            "chrome": {
              "version_added": "63"
            },
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            "firefox": {
              "version_added": "57"
            },
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                "version_added": "8.10.0",
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            "opera": {
              "version_added": "50"
            },
            "opera_android": {
              "version_added": "46"
            },
            "safari": {
              "version_added": "11"
            },
            "safari_ios": {
              "version_added": "11"
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          },
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            "standard_track": true,
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      "for_in": {
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          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for...in",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
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            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
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              "version_added": "3"
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            "nodejs": {
              "version_added": "0.10.0"
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            "opera": {
              "version_added": "2"
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              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
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            "samsunginternet_android": {
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            "webview_android": {
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          },
          "status": {
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            "standard_track": true,
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      "for_of": {
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          "description": "<code>for...of</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/for...of",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements",
          "support": {
            "chrome": {
              "version_added": "38"
            },
            "chrome_android": {
              "version_added": "38"
            },
            "deno": {
              "version_added": "1.0"
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            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "13",
              "notes": "Before Firefox 51, using the <code>for...of</code> loop construct with the <code>const</code> keyword threw a <code>SyntaxError</code> (\"missing = in const declaration\")."
            },
            "firefox_android": {
              "version_added": "14",
              "notes": "Before Firefox 51, using the <code>for...of</code> loop construct with the <code>const</code> keyword threw a <code>SyntaxError</code> (\"missing = in const declaration\")."
            },
            "ie": {
              "version_added": false
            },
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              "version_added": "0.12.0"
            },
            "opera": {
              "version_added": "25"
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            "opera_android": {
              "version_added": "25"
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            "safari": {
              "version_added": "7"
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            "safari_ios": {
              "version_added": "7"
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            "description": "async iterators",
            "support": {
              "chrome": {
                "version_added": "63"
              },
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                "version_added": "63"
              },
              "deno": {
                "version_added": "1.0"
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              "edge": {
                "version_added": "12"
              },
              "firefox": {
                "version_added": "57"
              },
              "firefox_android": {
                "version_added": "57"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "10.0.0"
              },
              "opera": {
                "version_added": "50"
              },
              "opera_android": {
                "version_added": "46"
              },
              "safari": {
                "version_added": "7"
              },
              "safari_ios": {
                "version_added": "7"
              },
              "samsunginternet_android": {
                "version_added": "8.0"
              },
              "webview_android": {
                "version_added": "63"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "closing_iterators": {
          "__compat": {
            "description": "Closing iterators",
            "support": {
              "chrome": {
                "version_added": "51"
              },
              "chrome_android": {
                "version_added": "51"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "14"
              },
              "firefox": {
                "version_added": "53"
              },
              "firefox_android": {
                "version_added": "53"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.5.0"
              },
              "opera": {
                "version_added": "38"
              },
              "opera_android": {
                "version_added": "41"
              },
              "safari": {
                "version_added": "7"
              },
              "safari_ios": {
                "version_added": "7"
              },
              "samsunginternet_android": {
                "version_added": "5.0"
              },
              "webview_android": {
                "version_added": "51"
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            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
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      },
      "function": {
        "__compat": {
          "description": "<code>function</code> statement",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-function-definitions",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "trailing_comma_in_parameters": {
          "__compat": {
            "description": "Trailing comma in parameters",
            "support": {
              "chrome": {
                "version_added": "58"
              },
              "chrome_android": {
                "version_added": "58"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "14"
              },
              "firefox": {
                "version_added": "52"
              },
              "firefox_android": {
                "version_added": "52"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "8.0.0"
              },
              "opera": {
                "version_added": "45"
              },
              "opera_android": {
                "version_added": "43"
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": "7.0"
              },
              "webview_android": {
                "version_added": "58"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "generator_function": {
        "__compat": {
          "description": "<code>function*</code> statement",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function*",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-generator-function-definitions",
          "support": {
            "chrome": {
              "version_added": "39"
            },
            "chrome_android": {
              "version_added": "39"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "13"
            },
            "firefox": {
              "version_added": "26"
            },
            "firefox_android": {
              "version_added": "26"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "4.0.0"
              },
              {
                "version_added": "0.12.0",
                "flags": [
                  {
                    "type": "runtime_flag",
                    "name": "--harmony"
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                ]
              }
            ],
            "opera": {
              "version_added": "26"
            },
            "opera_android": {
              "version_added": "26"
            },
            "safari": {
              "version_added": "10"
            },
            "safari_ios": {
              "version_added": "10"
            },
            "samsunginternet_android": {
              "version_added": "4.0"
            },
            "webview_android": {
              "version_added": "39"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "IteratorResult_object": {
          "__compat": {
            "description": "<code>IteratorResult</code> object instead of throwing",
            "support": {
              "chrome": {
                "version_added": "49"
              },
              "chrome_android": {
                "version_added": "49"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "13"
              },
              "firefox": {
                "version_added": "29"
              },
              "firefox_android": {
                "version_added": "29"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": "36"
              },
              "opera_android": {
                "version_added": "36"
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": "5.0"
              },
              "webview_android": {
                "version_added": "49"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "not_constructable_with_new": {
          "__compat": {
            "description": "Not constructable with <code>new</code> (ES2016)",
            "support": {
              "chrome": {
                "version_added": "50"
              },
              "chrome_android": {
                "version_added": "50"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "13"
              },
              "firefox": {
                "version_added": "43"
              },
              "firefox_android": {
                "version_added": "43"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "6.0.0"
              },
              "opera": {
                "version_added": "37"
              },
              "opera_android": {
                "version_added": "37"
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": "5.0"
              },
              "webview_android": {
                "version_added": "50"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "trailing_comma_in_parameters": {
          "__compat": {
            "description": "Trailing comma in parameters",
            "support": {
              "chrome": {
                "version_added": "58"
              },
              "chrome_android": {
                "version_added": "58"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "14"
              },
              "firefox": {
                "version_added": "52"
              },
              "firefox_android": {
                "version_added": "52"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "8.0.0"
              },
              "opera": {
                "version_added": "45"
              },
              "opera_android": {
                "version_added": "43"
              },
              "safari": {
                "version_added": "10"
              },
              "safari_ios": {
                "version_added": "10"
              },
              "samsunginternet_android": {
                "version_added": "7.0"
              },
              "webview_android": {
                "version_added": "58"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "if_else": {
        "__compat": {
          "description": "<code>if...else</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/if...else",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-if-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "import": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/import",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-scripts-and-modules.html#sec-imports",
          "support": {
            "chrome": {
              "version_added": "61"
            },
            "chrome_android": {
              "version_added": "61"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "16"
            },
            "firefox": {
              "version_added": "60"
            },
            "firefox_android": {
              "version_added": "60"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "13.2.0",
                "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              },
              {
                "version_added": "12.0.0",
                "version_removed": "13.2.0",
                "flags": [
                  {
                    "name": "--experimental-modules",
                    "type": "runtime_flag"
                  }
                ],
                "notes": "Modules must either have a filename ending in <code>.mjs</code>, or the nearest parent <code>package.json</code> file must contain <code>\"type\": \"module\"</code>. See Node's <a href='https://nodejs.org/docs/latest-v12.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              },
              {
                "version_added": "8.5.0",
                "version_removed": "12.0.0",
                "flags": [
                  {
                    "name": "--experimental-modules",
                    "type": "runtime_flag"
                  }
                ],
                "notes": "Module filenames must end with <code>.mjs</code>, not </code>.js</code>. See Node's <a href='https://nodejs.org/docs/latest-v8.x/api/esm.html#esm_enabling'>ECMAScript Modules documentation</a> for more details."
              }
            ],
            "opera": {
              "version_added": "48"
            },
            "opera_android": {
              "version_added": "45"
            },
            "safari": {
              "version_added": "10.1"
            },
            "safari_ios": {
              "version_added": "10.3"
            },
            "samsunginternet_android": {
              "version_added": "8.0"
            },
            "webview_android": {
              "version_added": "61"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "dynamic_import": {
          "__compat": {
            "description": "Dynamic import",
            "support": {
              "chrome": {
                "version_added": "63"
              },
              "chrome_android": {
                "version_added": "63"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": [
                {
                  "version_added": "67"
                },
                {
                  "version_added": "66",
                  "version_removed": "67",
                  "flags": [
                    {
                      "name": "javascript.options.dynamicImport",
                      "type": "preference",
                      "value_to_set": "true"
                    }
                  ]
                }
              ],
              "firefox_android": [
                {
                  "version_added": "67"
                },
                {
                  "version_added": "66",
                  "version_removed": "67",
                  "flags": [
                    {
                      "name": "javascript.options.dynamicImport",
                      "type": "preference",
                      "value_to_set": "true"
                    }
                  ]
                }
              ],
              "ie": {
                "version_added": false
              },
              "nodejs": [
                {
                  "version_added": "13.2.0",
                  "notes": "Dynamic <code>import</code> can be used in either CommonJS or ES module files, to import either CommonJS or ES module files. See Node's <a href='https://nodejs.org/api/esm.html#esm_import_expressions'>ECMAScript Modules documentation</a> for more details."
                },
                {
                  "version_added": "12.0.0",
                  "flags": [
                    {
                      "name": "--experimental-modules",
                      "type": "runtime_flag"
                    }
                  ],
                  "notes": "Dynamic <code>import</code> can be used in either CommonJS or ES module files, to import either CommonJS or ES module files. See Node's <a href='https://nodejs.org/api/esm.html#esm_import_expressions'>ECMAScript Modules documentation</a> for more details."
                }
              ],
              "opera": {
                "version_added": "50"
              },
              "opera_android": {
                "version_added": "46"
              },
              "safari": {
                "version_added": "11.1"
              },
              "safari_ios": {
                "version_added": "11.3"
              },
              "samsunginternet_android": {
                "version_added": "8.0"
              },
              "webview_android": {
                "version_added": "63"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "worker_support": {
          "__compat": {
            "description": "Available in workers",
            "support": {
              "chrome": [
                {
                  "version_added": "80"
                },
                {
                  "version_added": "67",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "Experimental Web Platform Features"
                    }
                  ]
                }
              ],
              "chrome_android": [
                {
                  "version_added": "80"
                },
                {
                  "version_added": "67",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "Experimental Web Platform Features"
                    }
                  ]
                }
              ],
              "deno": {
                "version_added": "1.0"
              },
              "edge": [
                {
                  "version_added": "80"
                },
                {
                  "version_added": "79",
                  "flags": [
                    {
                      "type": "preference",
                      "name": "Experimental Web Platform Features"
                    }
                  ]
                }
              ],
              "firefox": {
                "version_added": false,
                "notes": "See <a href='https://bugzil.la/1247687'>bug 1247687</a>."
              },
              "firefox_android": {
                "version_added": false,
                "notes": "See <a href='https://bugzil.la/1247687'>bug 1247687</a>."
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "opera": {
                "version_added": false
              },
              "opera_android": {
                "version_added": false
              },
              "safari": {
                "version_added": "15"
              },
              "safari_ios": {
                "version_added": "15"
              },
              "samsunginternet_android": {
                "version_added": "13.0"
              },
              "webview_android": {
                "version_added": "80"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "import_meta": {
        "__compat": {
          "description": "<code>import.meta</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/import.meta",
          "spec_url": [
            "https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#prod-ImportMeta",
            "https://html.spec.whatwg.org/multipage/webappapis.html#hostgetimportmetaproperties"
          ],
          "support": {
            "chrome": {
              "version_added": "64"
            },
            "chrome_android": {
              "version_added": "64"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "79"
            },
            "firefox": {
              "version_added": "62"
            },
            "firefox_android": {
              "version_added": "62"
            },
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": "10.4.0"
            },
            "opera": {
              "version_added": "51"
            },
            "opera_android": {
              "version_added": "47"
            },
            "safari": {
              "version_added": "11.1"
            },
            "safari_ios": {
              "version_added": "12"
            },
            "samsunginternet_android": {
              "version_added": "9.0"
            },
            "webview_android": {
              "version_added": "64"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "label": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/label",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-labelled-statements",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "4"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "let": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/let",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations",
          "support": {
            "chrome": [
              {
                "version_added": "49"
              },
              {
                "version_added": "48",
                "version_removed": "49",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Enable Experimental JavaScript Features"
                  }
                ],
                "notes": "Support outside of <a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>strict mode</a>."
              },
              {
                "version_added": "41",
                "version_removed": "49",
                "partial_implementation": true,
                "notes": "<a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>Strict mode</a> is required."
              }
            ],
            "chrome_android": [
              {
                "version_added": "49"
              },
              {
                "version_added": "48",
                "version_removed": "49",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Enable Experimental JavaScript Features"
                  }
                ],
                "notes": "Support outside of <a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>strict mode</a>."
              },
              {
                "version_added": "41",
                "version_removed": "49",
                "partial_implementation": true,
                "notes": "<a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>Strict mode</a> is required."
              }
            ],
            "deno": {
              "version_added": "1.0"
            },
            "edge": [
              {
                "version_added": "14"
              },
              {
                "version_added": "12",
                "version_removed": "14",
                "partial_implementation": true,
                "notes": "In Edge 12 and 13, <code>let</code> within a <code>for</code> loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the <code>let</code> immediately before the loop."
              }
            ],
            "firefox": {
              "version_added": "44",
              "notes": [
                "Before Firefox 44, <code>let</code> is only available to code blocks in HTML wrapped in a <code>&lt;script type=\"application/javascript;version=1.7\"&gt;</code> block (or higher version) and has different semantics (e.g. no temporal dead zone).",
                "Before Firefox 46, a <code>TypeError</code> is thrown on redeclaration instead of a <code>SyntaxError</code>.",
                "Firefox 54 adds support of <code>let</code> in workers."
              ]
            },
            "firefox_android": {
              "version_added": "44",
              "notes": [
                "Before Firefox 44, <code>let</code> is only available to code blocks in HTML wrapped in a <code>&lt;script type=\"application/javascript;version=1.7\"&gt;</code> block (or higher version) and has different semantics (e.g. no temporal dead zone).",
                "Before Firefox 46, a <code>TypeError</code> is thrown on redeclaration instead of a <code>SyntaxError</code>.",
                "Firefox 54 adds support of <code>let</code> in workers."
              ]
            },
            "ie": {
              "version_added": "11",
              "partial_implementation": true,
              "notes": "In Internet Explorer, <code>let</code> within a <code>for</code> loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the <code>let</code> immediately before the loop."
            },
            "nodejs": {
              "version_added": "6.0.0"
            },
            "opera": {
              "version_added": "17"
            },
            "opera_android": {
              "version_added": "18"
            },
            "safari": {
              "version_added": "10"
            },
            "safari_ios": {
              "version_added": "10"
            },
            "samsunginternet_android": [
              {
                "version_added": "5.0"
              },
              {
                "notes": "<a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>Strict mode</a> is required.",
                "partial_implementation": true,
                "version_added": "4.0",
                "version_removed": "5.0"
              }
            ],
            "webview_android": [
              {
                "version_added": "49"
              },
              {
                "version_added": "41",
                "version_removed": "49",
                "partial_implementation": true,
                "notes": "<a href='https://developer.mozilla.org/docs/Web/JavaScript/Reference/Strict_mode'>Strict mode</a> is required."
              }
            ]
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "return": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/return",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-return-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "switch": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/switch",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-switch-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "4"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "throw": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/throw",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-throw-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "5"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "try_catch": {
        "__compat": {
          "description": "<code>try...catch</code>",
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/try...catch",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-try-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "5"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "optional_catch_binding": {
          "__compat": {
            "description": "Optional catch binding",
            "support": {
              "chrome": {
                "version_added": "66"
              },
              "chrome_android": {
                "version_added": "66"
              },
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "58"
              },
              "firefox_android": {
                "version_added": "58"
              },
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "10.0.0"
              },
              "opera": {
                "version_added": "53"
              },
              "opera_android": {
                "version_added": "47"
              },
              "safari": {
                "version_added": "11.1"
              },
              "safari_ios": {
                "version_added": "11.3"
              },
              "samsunginternet_android": {
                "version_added": "9.0"
              },
              "webview_android": {
                "version_added": "66"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "var": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/var",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-variable-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "while": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/while",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-while-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "3"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "with": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/with",
          "spec_url": "https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-with-statement",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "3"
            },
            "nodejs": {
              "version_added": "0.10.0"
            },
            "opera": {
              "version_added": "4"
            },
            "opera_android": {
              "version_added": "10.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": {
              "version_added": "1"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
      }
    }
  }
}