{
  "api": {
    "Worker": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker",
        "spec_url": "https://html.spec.whatwg.org/multipage/workers.html#dedicated-workers-and-the-worker-interface",
        "tags": [
          "web-features:dedicated-workers"
        ],
        "support": {
          "chrome": {
            "version_added": "2"
          },
          "chrome_android": "mirror",
          "deno": {
            "version_added": "1.0"
          },
          "edge": {
            "version_added": "12"
          },
          "firefox": {
            "version_added": "3.5"
          },
          "firefox_android": "mirror",
          "ie": {
            "version_added": "10"
          },
          "nodejs": {
            "version_added": "11.7.0",
            "partial_implementation": true,
            "notes": [
              "Inherits from a Node `EventEmitter` instead of DOM `EventTarget`.",
              "Also supports CommonJS modules, enabled for files ending with `.cjs` and for files ending with `.js` when the nearest parent `package.json` file contains a top-level field `\"type\"` with a value not of `\"commonjs\"`.",
              "Available as a part of the `worker_threads` module."
            ]
          },
          "oculus": "mirror",
          "opera": {
            "version_added": "10.6"
          },
          "opera_android": {
            "version_added": "11"
          },
          "safari": {
            "version_added": "4"
          },
          "safari_ios": {
            "version_added": "5"
          },
          "samsunginternet_android": "mirror",
          "webview_android": "mirror",
          "webview_ios": "mirror"
        },
        "status": {
          "experimental": false,
          "standard_track": true,
          "deprecated": false
        }
      },
      "Worker": {
        "__compat": {
          "description": "`Worker()` constructor",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/Worker",
          "spec_url": "https://html.spec.whatwg.org/multipage/workers.html#dom-worker-dev",
          "tags": [
            "web-features:dedicated-workers"
          ],
          "support": {
            "chrome": {
              "version_added": "4"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "3.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "11.7.0",
              "partial_implementation": true,
              "notes": "Takes entirely different options parameters."
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "4"
            },
            "safari_ios": {
              "version_added": "5"
            },
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "ecmascript_modules": {
          "__compat": {
            "description": "Support for ECMAScript modules",
            "tags": [
              "web-features:js-modules-workers"
            ],
            "support": {
              "chrome": {
                "version_added": "80"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "114"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": "12.17.0",
                "partial_implementation": true,
                "notes": "ECMAScript modules are enabled for files ending with `.mjs` and for files ending with `.js` when the nearest parent `package.json` file contains a top-level field `\"type\"` with a value of `\"module\"`."
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "15",
                "notes": [
                  "Nested workers support was introduced in Safari 15.5.",
                  "Script loading in nested workers was introduced in Safari 16.4."
                ]
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "mime_checks": {
          "__compat": {
            "description": "Strict MIME type checks for worker scripts",
            "tags": [
              "web-features:dedicated-workers"
            ],
            "support": {
              "chrome": {
                "version_added": false,
                "impl_url": "https://crbug.com/40554522"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": false
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "81"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "16"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "options_name_parameter": {
          "__compat": {
            "description": "`options.name` parameter",
            "tags": [
              "web-features:dedicated-workers"
            ],
            "support": {
              "chrome": {
                "version_added": "70"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0"
              },
              "edge": {
                "version_added": "18"
              },
              "firefox": {
                "version_added": "55"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "12.1"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "options_type_parameter": {
          "__compat": {
            "description": "`options.type` parameter",
            "tags": [
              "web-features:js-modules-workers"
            ],
            "support": {
              "chrome": {
                "version_added": "80"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.0",
                "notes": "Only supports `module`"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "114"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "15"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "worker_support": {
        "__compat": {
          "description": "Available in workers",
          "tags": [
            "web-features:dedicated-workers"
          ],
          "support": {
            "chrome": {
              "version_added": "69",
              "partial_implementation": true,
              "notes": "Not available in Shared Workers. See [bug 40695450](https://crbug.com/40695450)."
            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "34"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": "11.7.0"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "16.4",
              "partial_implementation": true,
              "notes": "Not available in Shared Workers. See [bug 265263](https://webkit.org/b/265263)."
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "error_event": {
        "__compat": {
          "description": "`error` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/error_event",
          "spec_url": "https://html.spec.whatwg.org/multipage/workers.html#handler-abstractworker-onerror",
          "tags": [
            "web-features:dedicated-workers"
          ],
          "support": {
            "chrome": {
              "version_added": "4"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "3.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "11.7.0",
              "partial_implementation": true,
              "notes": "Supports the event, but only via Node `EventEmitter`."
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "4"
            },
            "safari_ios": {
              "version_added": "5"
            },
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "message_event": {
        "__compat": {
          "description": "`message` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/message_event",
          "spec_url": "https://html.spec.whatwg.org/multipage/indices.html#event-message",
          "tags": [
            "web-features:postmessage"
          ],
          "support": {
            "chrome": {
              "version_added": "4"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "3.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "11.7.0",
              "partial_implementation": true,
              "notes": "Supports the event, but only via Node `EventEmitter`."
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11.5"
            },
            "safari": {
              "version_added": "4"
            },
            "safari_ios": {
              "version_added": "5"
            },
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "messageerror_event": {
        "__compat": {
          "description": "`messageerror` event",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/messageerror_event",
          "spec_url": "https://html.spec.whatwg.org/multipage/indices.html#event-messageerror",
          "tags": [
            "web-features:messageerror"
          ],
          "support": {
            "chrome": {
              "version_added": false
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "18",
              "version_removed": "79"
            },
            "firefox": {
              "version_added": "57"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": false
            },
            "nodejs": [
              {
                "version_added": "14.5.0",
                "partial_implementation": true,
                "notes": "Supports the event, but only via Node `EventEmitter`."
              },
              {
                "version_added": "12.19.0",
                "version_removed": "13.0.0",
                "partial_implementation": true,
                "notes": "Supports the event, but only via Node `EventEmitter`."
              }
            ],
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "16.4"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "postMessage": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/postMessage",
          "spec_url": "https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage-dev",
          "tags": [
            "web-features:postmessage"
          ],
          "support": {
            "chrome": {
              "version_added": "2"
            },
            "chrome_android": "mirror",
            "deno": [
              {
                "version_added": "1.14",
                "notes": "The `message` parameter does not support cloning `Blob` values."
              },
              {
                "version_added": "1.12",
                "version_removed": "1.14",
                "partial_implementation": true,
                "notes": [
                  "The `message` parameter does not support cloning `Blob` values.",
                  "The `transfer` parameter does not accept `ArrayBuffer` items. Passing an `ArrayBuffer` results in an error being thrown."
                ]
              },
              {
                "version_added": "1.10",
                "version_removed": "1.12",
                "partial_implementation": true,
                "notes": [
                  "The `message` parameter does not support `SharedArrayBuffer`.",
                  "The `transfer` parameter is not supported, and results in an error being thrown."
                ]
              },
              {
                "version_added": "1.0",
                "version_removed": "1.10",
                "partial_implementation": true,
                "notes": [
                  "Data passed in the `message` parameter is serialized with JSON, not the structured clone algorithm.",
                  "The `transfer` parameter is not supported, and results in an error being thrown."
                ]
              }
            ],
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "3.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10",
              "notes": "Internet Explorer does not support `Transferable` objects."
            },
            "nodejs": {
              "version_added": "11.7.0",
              "partial_implementation": true,
              "notes": [
                "Only accepts an array of transfer objects as the second parameter, not an options object with a `transfer` property.",
                "Only supports transferring `ArrayBuffer` and `MessagePort` objects."
              ]
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "4"
            },
            "safari_ios": {
              "version_added": "5"
            },
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "options_includeUserActivation_parameter": {
          "__compat": {
            "description": "`options.includeUserActivation` parameter",
            "support": {
              "chrome": {
                "version_added": "72"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": false
              },
              "edge": "mirror",
              "firefox": {
                "version_added": false
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
              "nodejs": {
                "version_added": false
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": false
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": false,
              "deprecated": false
            }
          }
        }
      },
      "terminate": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Worker/terminate",
          "spec_url": "https://html.spec.whatwg.org/multipage/workers.html#dom-worker-terminate-dev",
          "tags": [
            "web-features:dedicated-workers"
          ],
          "support": {
            "chrome": {
              "version_added": "2"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "3.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": [
              {
                "version_added": "12.5.0",
                "partial_implementation": true,
                "notes": "Returns a `Promise`."
              },
              {
                "version_added": "11.7.0",
                "partial_implementation": true,
                "notes": "Takes an optional callback parameter to be executed when the worker has terminated."
              }
            ],
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "4"
            },
            "safari_ios": {
              "version_added": "5"
            },
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      }
    }
  }
}