{
  "api": {
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          },
          "chrome_android": {
            "version_added": true
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          "edge": {
            "version_added": "12"
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          "firefox": {
            "version_added": true
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          "firefox_android": {
            "version_added": true
          },
          "ie": {
            "version_added": true
          },
          "opera": {
            "version_added": true
          },
          "opera_android": {
            "version_added": true
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          "safari": {
            "version_added": true
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          "safari_ios": {
            "version_added": true
          },
          "samsunginternet_android": {
            "version_added": true
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          "webview_android": {
            "version_added": true
          }
        },
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          "standard_track": true,
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        }
      },
      "onafterprint": {
        "__compat": {
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          "support": {
            "chrome": {
              "version_added": "63"
            },
            "chrome_android": {
              "version_added": "63"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "6"
            },
            "firefox_android": {
              "version_added": null
            },
            "ie": {
              "version_added": true
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            "opera": {
              "version_added": "50"
            },
            "opera_android": {
              "version_added": "46"
            },
            "safari": {
              "version_added": "13"
            },
            "safari_ios": {
              "version_added": "13"
            },
            "samsunginternet_android": {
              "version_added": "8.0"
            },
            "webview_android": {
              "version_added": "63"
            }
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
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        }
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            "chrome": {
              "version_added": "63"
            },
            "chrome_android": {
              "version_added": "63"
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            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "6"
            },
            "firefox_android": {
              "version_added": null
            },
            "ie": {
              "version_added": true
            },
            "opera": {
              "version_added": "50"
            },
            "opera_android": {
              "version_added": "46"
            },
            "safari": {
              "version_added": "13"
            },
            "safari_ios": {
              "version_added": "13"
            },
            "samsunginternet_android": {
              "version_added": "8.0"
            },
            "webview_android": {
              "version_added": "63"
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          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onbeforeunload",
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            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
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            "firefox_android": {
              "version_added": "4"
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            "ie": {
              "version_added": "4"
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            "opera": {
              "version_added": "12"
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            "opera_android": {
              "version_added": "12"
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            "safari": {
              "version_added": "3"
            },
            "safari_ios": {
              "version_added": "1"
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            "samsunginternet_android": {
              "version_added": "1.0"
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            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
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            "description": "Custom text support",
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              "chrome": {
                "version_added": true,
                "version_removed": "51"
              },
              "chrome_android": {
                "version_added": true,
                "version_removed": "51"
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              "edge": {
                "version_added": false
              },
              "firefox": {
                "version_added": true,
                "version_removed": "44"
              },
              "firefox_android": {
                "version_added": true,
                "version_removed": "44"
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              "ie": {
                "version_added": true
              },
              "opera": {
                "version_added": true,
                "version_removed": "38"
              },
              "opera_android": {
                "version_added": true,
                "version_removed": "41"
              },
              "safari": {
                "version_added": true,
                "version_removed": "9"
              },
              "safari_ios": {
                "version_added": false
              },
              "samsunginternet_android": {
                "version_added": true,
                "version_removed": "5.0"
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              "webview_android": {
                "version_added": true,
                "version_removed": "51"
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            },
            "status": {
              "experimental": false,
              "standard_track": false,
              "deprecated": true
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          }
        }
      },
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onhashchange",
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              "version_added": "5"
            },
            "chrome_android": {
              "version_added": "18"
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              "version_added": "4"
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              "version_added": "8"
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              "version_added": "10"
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            "safari_ios": {
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            "standard_track": true,
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      },
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            },
            "chrome_android": {
              "version_added": "37"
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            "firefox_android": {
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              "version_added": false
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              "version_added": "24"
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            "opera_android": {
              "version_added": "24"
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            "safari": {
              "version_added": null
            },
            "safari_ios": {
              "version_added": null
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              "version_added": "4.0"
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          },
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            "experimental": true,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onmessage",
          "support": {
            "chrome": {
              "version_added": "60"
            },
            "chrome_android": {
              "version_added": "60"
            },
            "edge": {
              "version_added": "≤79"
            },
            "firefox": {
              "version_added": null
            },
            "firefox_android": {
              "version_added": null
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              "version_added": null
            },
            "opera": {
              "version_added": "47"
            },
            "opera_android": {
              "version_added": "44"
            },
            "safari": {
              "version_added": null
            },
            "safari_ios": {
              "version_added": null
            },
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          },
          "status": {
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            "standard_track": true,
            "deprecated": false
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        }
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      "onmessageerror": {
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          "support": {
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              "version_added": "60"
            },
            "chrome_android": {
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            "edge": {
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            "firefox": {
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            "opera_android": {
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            "safari": {
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            "standard_track": true,
            "deprecated": false
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        },
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              },
              "chrome_android": {
                "version_added": "60"
              },
              "edge": {
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                "version_added": null
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              "opera_android": {
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              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
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              "webview_android": {
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              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "onpopstate": {
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onpopstate",
          "support": {
            "chrome": {
              "version_added": "5"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "4"
            },
            "firefox_android": {
              "version_added": "4"
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            "ie": {
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            },
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            "opera_android": {
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            }
          },
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            "standard_track": true,
            "deprecated": false
          }
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              "version_added": "49"
            },
            "chrome_android": {
              "version_added": "49"
            },
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            },
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              },
              {
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                  {
                    "type": "preference",
                    "name": "dom.promise_rejection_events.enabled",
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                  }
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              {
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                  {
                    "type": "preference",
                    "name": "dom.promise_rejection_events.enabled",
                    "value_to_set": "true"
                  }
                ],
                "notes": "This event handler was added in Firefox 55 but was disabled since it wasn't fully implemented. It was fully implemented in Firefox 68 and enabled by default in Firefox 69."
              }
            ],
            "firefox_android": [
              {
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                "flags": [
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                    "type": "preference",
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                ]
              },
              {
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                    "type": "preference",
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                  }
                ],
                "notes": "This event handler was added in Firefox 55 but was disabled since it wasn't fully implemented. It was fully implemented in Firefox 68 but not enabled by default."
              }
            ],
            "ie": {
              "version_added": false
            },
            "opera": {
              "version_added": "36"
            },
            "opera_android": {
              "version_added": false
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            },
            "safari_ios": {
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            },
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            }
          },
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            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "onstorage": {
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onstorage",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "≤18"
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            "firefox": {
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            },
            "firefox_android": {
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            },
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              "version_added": null
            },
            "opera": {
              "version_added": "15"
            },
            "opera_android": {
              "version_added": "14"
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              "version_added": null
            },
            "safari_ios": {
              "version_added": null
            },
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            }
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            "standard_track": true,
            "deprecated": false
          }
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            },
            "chrome_android": {
              "version_added": "49"
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            "edge": {
              "version_added": "≤79"
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                "version_added": "69"
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              {
                "version_added": "68",
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                    "type": "preference",
                    "name": "dom.promise_rejection_events.enabled",
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                ]
              },
              {
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                  {
                    "type": "preference",
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                  }
                ],
                "notes": "This event handler was added in Firefox 55 but was disabled since it wasn't fully implemented. It was fully implemented in Firefox 68 and enabled by default in Firefox 69."
              }
            ],
            "firefox_android": [
              {
                "version_added": "68",
                "flags": [
                  {
                    "type": "preference",
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                ]
              },
              {
                "version_added": "55",
                "partial_implementation": true,
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                    "type": "preference",
                    "name": "dom.promise_rejection_events.enabled",
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                  }
                ],
                "notes": "This event handler was added in Firefox 55 but was disabled since it wasn't fully implemented. It was fully implemented in Firefox 68 but not enabled by default."
              }
            ],
            "ie": {
              "version_added": false
            },
            "opera": {
              "version_added": "36"
            },
            "opera_android": {
              "version_added": false
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            }
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            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "onunload": {
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onunload",
          "support": {
            "chrome": {
              "version_added": true
            },
            "chrome_android": {
              "version_added": true
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": true
            },
            "firefox_android": {
              "version_added": true
            },
            "ie": {
              "version_added": true
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": true
            },
            "safari_ios": {
              "version_added": true
            },
            "samsunginternet_android": {
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            },
            "webview_android": {
              "version_added": true
            }
          },
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            "standard_track": true,
            "deprecated": false
          }
        }
      }
    }
  }
}