{
  "api": {
    "MouseEvent": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent",
        "support": {
          "chrome": {
            "version_added": "1"
          },
          "chrome_android": {
            "version_added": "18"
          },
          "edge": {
            "version_added": "12"
          },
          "firefox": {
            "version_added": "1"
          },
          "firefox_android": {
            "version_added": "4"
          },
          "ie": {
            "version_added": "9"
          },
          "opera": {
            "version_added": "10.6"
          },
          "opera_android": {
            "version_added": "11"
          },
          "safari": {
            "version_added": "3.1"
          },
          "safari_ios": {
            "version_added": "2"
          },
          "samsunginternet_android": {
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          },
          "webview_android": {
            "version_added": "1"
          }
        },
        "status": {
          "experimental": false,
          "standard_track": true,
          "deprecated": false
        }
      },
      "MouseEvent": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/MouseEvent",
          "description": "<code>MouseEvent()</code> constructor",
          "support": {
            "chrome": {
              "version_added": "47"
            },
            "chrome_android": {
              "version_added": "47"
            },
            "edge": {
              "version_added": "≤79"
            },
            "firefox": {
              "version_added": "11"
            },
            "firefox_android": {
              "version_added": "14"
            },
            "ie": {
              "version_added": false
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": true
            },
            "safari_ios": {
              "version_added": true
            },
            "samsunginternet_android": {
              "version_added": "5.0"
            },
            "webview_android": {
              "version_added": "47"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "long_to_double": {
          "__compat": {
            "description": "Redefined <code>mouseEventInit</code> fields from <code>long</code> to <code>double</code>",
            "support": {
              "chrome": {
                "version_added": "56"
              },
              "chrome_android": {
                "version_added": "56"
              },
              "edge": {
                "version_added": "≤79"
              },
              "firefox": {
                "version_added": null
              },
              "firefox_android": {
                "version_added": null
              },
              "ie": {
                "version_added": false
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": "6.0"
              },
              "webview_android": {
                "version_added": "56"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "region_support": {
          "__compat": {
            "description": "Support for <code>mouseEventInit</code> optional <code>region</code> field",
            "support": {
              "chrome": {
                "version_added": "51",
                "notes": "Flag needed to retrieve value from <code>MouseEvent.region</code>.",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental Web Platform Features",
                    "value_to_set": "true"
                  }
                ]
              },
              "chrome_android": {
                "version_added": false
              },
              "edge": {
                "version_added": "≤79",
                "notes": "Flag needed to retrieve value from <code>MouseEvent.region</code>.",
                "flags": [
                  {
                    "type": "preference",
                    "name": "Experimental Web Platform Features",
                    "value_to_set": "true"
                  }
                ]
              },
              "firefox": {
                "version_added": "32"
              },
              "firefox_android": {
                "version_added": "32"
              },
              "ie": {
                "version_added": false
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": false
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "altKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/altKey",
          "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": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "button": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/button",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "9"
            },
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "3.1"
            },
            "safari_ios": {
              "version_added": "2"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "buttons": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/buttons",
          "support": {
            "chrome": {
              "version_added": "43"
            },
            "chrome_android": {
              "version_added": false
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": true,
              "notes": "Resrictions apply depending on OS."
            },
            "firefox_android": {
              "version_added": true
            },
            "ie": {
              "version_added": "9"
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": "11.1"
            },
            "safari_ios": {
              "version_added": "11.3"
            },
            "samsunginternet_android": {
              "version_added": false
            },
            "webview_android": {
              "version_added": false
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "clientX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/clientX",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": {
              "version_added": "18"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": {
              "version_added": "4"
            },
            "ie": {
              "version_added": "9"
            },
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "3.1"
            },
            "safari_ios": {
              "version_added": "2"
            },
            "samsunginternet_android": {
              "version_added": "1.0"
            },
            "webview_android": {
              "version_added": "1"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "long_to_double": {
          "__compat": {
            "description": "Value type changed from <code>long</code> to <code>double</code>",
            "support": {
              "chrome": {
                "version_added": "56"
              },
              "chrome_android": {
                "version_added": "56"
              },
              "edge": {
                "version_added": "≤79"
              },
              "firefox": {
                "version_added": null
              },
              "firefox_android": {
                "version_added": null
              },
              "ie": {
                "version_added": null
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": "6.0"
              },
              "webview_android": {
                "version_added": "56"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "clientY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/clientY",
          "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": "9"
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": true
            },
            "safari_ios": {
              "version_added": true
            },
            "samsunginternet_android": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "long_to_double": {
          "__compat": {
            "description": "Value type changed from <code>long</code> to <code>double</code>",
            "support": {
              "chrome": {
                "version_added": "56"
              },
              "chrome_android": {
                "version_added": "56"
              },
              "edge": {
                "version_added": "≤79"
              },
              "firefox": {
                "version_added": null
              },
              "firefox_android": {
                "version_added": null
              },
              "ie": {
                "version_added": null
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": "6.0"
              },
              "webview_android": {
                "version_added": "56"
              }
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "ctrlKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/ctrlKey",
          "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": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getModifierState": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/getModifierState",
          "support": {
            "chrome": {
              "version_added": "47"
            },
            "chrome_android": {
              "version_added": "47"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": true
            },
            "firefox_android": {
              "version_added": true
            },
            "ie": {
              "version_added": null
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": null
            },
            "safari_ios": {
              "version_added": null
            },
            "samsunginternet_android": {
              "version_added": "5.0"
            },
            "webview_android": {
              "version_added": "47"
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "accel_support": {
          "__compat": {
            "description": "<code>\"Accel\"</code> parameter",
            "support": {
              "chrome": {
                "version_added": false
              },
              "chrome_android": {
                "version_added": false
              },
              "edge": {
                "version_added": false
              },
              "firefox": {
                "version_added": null
              },
              "firefox_android": {
                "version_added": null
              },
              "ie": {
                "version_added": null
              },
              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
              },
              "samsunginternet_android": {
                "version_added": false
              },
              "webview_android": {
                "version_added": false
              }
            },
            "status": {
              "experimental": false,
              "standard_track": false,
              "deprecated": true
            }
          }
        }
      },
      "initMouseEvent": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/initMouseEvent",
          "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": null
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": null
            },
            "safari_ios": {
              "version_added": null
            },
            "samsunginternet_android": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": false,
            "standard_track": false,
            "deprecated": true
          }
        }
      },
      "metaKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/metaKey",
          "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": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "movementX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/movementX",
          "support": {
            "chrome": [
              {
                "version_added": "37"
              },
              {
                "version_added": "22",
                "version_removed": "37",
                "prefix": "webkit"
              }
            ],
            "chrome_android": [
              {
                "version_added": "37"
              },
              {
                "version_added": true,
                "version_removed": "37",
                "prefix": "webkit"
              }
            ],
            "edge": {
              "version_added": "13"
            },
            "firefox": [
              {
                "version_added": "41"
              },
              {
                "version_added": "1",
                "version_removed": "41",
                "prefix": "moz"
              }
            ],
            "firefox_android": [
              {
                "version_added": "41"
              },
              {
                "version_added": "4",
                "version_removed": "41",
                "prefix": "moz"
              }
            ],
            "ie": {
              "version_added": false
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": [
              {
                "version_added": "9"
              },
              {
                "version_added": "6",
                "version_removed": "8",
                "prefix": "webkit"
              }
            ],
            "safari_ios": [
              {
                "version_added": "8"
              },
              {
                "version_added": "6",
                "version_removed": "8",
                "prefix": "webkit"
              }
            ],
            "samsunginternet_android": [
              {
                "version_added": "3.0"
              },
              {
                "version_added": true,
                "version_removed": "3.0",
                "prefix": "webkit"
              }
            ],
            "webview_android": [
              {
                "version_added": "37"
              },
              {
                "version_added": true,
                "version_removed": "37",
                "prefix": "webkit"
              }
            ]
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "movementY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/movementY",
          "support": {
            "chrome": [
              {
                "version_added": "37"
              },
              {
                "version_added": "22",
                "version_removed": "37",
                "prefix": "webkit"
              }
            ],
            "chrome_android": [
              {
                "version_added": "37"
              },
              {
                "version_added": true,
                "version_removed": "37",
                "prefix": "webkit"
              }
            ],
            "edge": {
              "version_added": "13"
            },
            "firefox": [
              {
                "version_added": "41"
              },
              {
                "version_added": "1",
                "version_removed": "41",
                "prefix": "moz"
              }
            ],
            "firefox_android": [
              {
                "version_added": "41"
              },
              {
                "version_added": "4",
                "version_removed": "41",
                "prefix": "moz"
              }
            ],
            "ie": {
              "version_added": false
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": [
              {
                "version_added": "9"
              },
              {
                "version_added": "6",
                "version_removed": "8",
                "prefix": "webkit"
              }
            ],
            "safari_ios": [
              {
                "version_added": "8"
              },
              {
                "version_added": "6",
                "version_removed": "8",
                "prefix": "webkit"
              }
            ],
            "samsunginternet_android": [
              {
                "version_added": "3.0"
              },
              {
                "version_added": true,
                "version_removed": "3.0",
                "prefix": "webkit"
              }
            ],
            "webview_android": [
              {
                "version_added": "37"
              },
              {
                "version_added": true,
                "version_removed": "37",
                "prefix": "webkit"
              }
            ]
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "offsetX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/offsetX",
          "support": {
            "chrome": {
              "version_added": true
            },
            "chrome_android": {
              "version_added": true
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "39"
            },
            "firefox_android": {
              "version_added": "43"
            },
            "ie": {
              "version_added": "9"
            },
            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": true
            },
            "safari_ios": {
              "version_added": true
            },
            "samsunginternet_android": {
              "version_added": true
            },
            "webview_android": {
              "version_added": true
            }
          },
          "status": {
            "experimental": true,
            "standard_track": true,
            "deprecated": false
          }
        },
        "long_to_double": {
          "__compat": {
            "description": "Value type changed from <code>long</code> to <code>double</code>",
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                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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                "version_added": "≤79"
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              "firefox": {
                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": "56"
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            "chrome": {
              "version_added": true
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            "chrome_android": {
              "version_added": true
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              "version_added": "12"
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              "version_added": "39"
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              "version_added": "43"
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              "version_added": "9"
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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            "experimental": true,
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            "deprecated": false
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              "chrome": {
                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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              "edge": {
                "version_added": "≤79"
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              "firefox": {
                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
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              "safari_ios": {
                "version_added": null
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              "samsunginternet_android": {
                "version_added": "6.0"
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              "webview_android": {
                "version_added": "56"
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              "experimental": false,
              "standard_track": true,
              "deprecated": false
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/pageX",
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            "chrome": {
              "version_added": "45"
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            "chrome_android": {
              "version_added": "45"
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            "edge": {
              "version_added": "12"
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            "firefox": {
              "version_added": true
            },
            "firefox_android": {
              "version_added": true
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": "5.0"
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            "webview_android": {
              "version_added": "45"
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            "experimental": true,
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            "description": "Value type changed from <code>long</code> to <code>double</code>",
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              "chrome": {
                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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              "edge": {
                "version_added": "≤79"
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              "firefox": {
                "version_added": false
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                "version_added": false
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                "version_added": null
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              "opera": {
                "version_added": null
              },
              "opera_android": {
                "version_added": null
              },
              "safari": {
                "version_added": null
              },
              "safari_ios": {
                "version_added": null
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              "samsunginternet_android": {
                "version_added": "6.0"
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              "webview_android": {
                "version_added": "56"
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              "experimental": false,
              "standard_track": true,
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/pageY",
          "support": {
            "chrome": {
              "version_added": "45"
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            "chrome_android": {
              "version_added": "45"
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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
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": "5.0"
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            "webview_android": {
              "version_added": "45"
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          "status": {
            "experimental": true,
            "standard_track": true,
            "deprecated": false
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            "description": "Value type changed from <code>long</code> to <code>double</code>",
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              "chrome": {
                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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              "edge": {
                "version_added": "≤79"
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              "firefox": {
                "version_added": false
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                "version_added": false
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                "version_added": null
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              "opera": {
                "version_added": null
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              "opera_android": {
                "version_added": null
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              "safari": {
                "version_added": null
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              "safari_ios": {
                "version_added": null
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              "samsunginternet_android": {
                "version_added": "6.0"
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              "webview_android": {
                "version_added": "56"
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            },
            "status": {
              "experimental": false,
              "standard_track": true,
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          }
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/region",
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            "chrome": {
              "version_added": true,
              "flags": [
                {
                  "type": "preference",
                  "name": "Experimental Web Platform Features",
                  "value_to_set": "true"
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            },
            "chrome_android": {
              "version_added": false
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              "version_added": "≤79",
              "flags": [
                {
                  "type": "preference",
                  "name": "Experimental Web Platform Features",
                  "value_to_set": "true"
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              ]
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            "firefox": {
              "version_added": "30",
              "flags": [
                {
                  "type": "preference",
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                  "value_to_set": "true"
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            "firefox_android": {
              "version_added": "30",
              "flags": [
                {
                  "type": "preference",
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                  "value_to_set": "true"
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            "ie": {
              "version_added": false
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            "opera": {
              "version_added": false
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            "opera_android": {
              "version_added": false
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            "safari": {
              "version_added": false
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            "safari_ios": {
              "version_added": false
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            "samsunginternet_android": {
              "version_added": false
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              "version_added": false
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            "chrome": {
              "version_added": true
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            "chrome_android": {
              "version_added": true
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              "version_added": "12"
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              "version_added": "48"
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              "version_added": true
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              "version_added": true
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              "version_added": true
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              "version_added": true
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              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
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        }
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/screenX",
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            "chrome": {
              "version_added": true
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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
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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            "description": "Value type changed from <code>long</code> to <code>double</code>",
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                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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              "edge": {
                "version_added": "≤79"
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              "firefox": {
                "version_added": null
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                "version_added": null
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                "version_added": null
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              "opera": {
                "version_added": null
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              "opera_android": {
                "version_added": null
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              "safari": {
                "version_added": null
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              "safari_ios": {
                "version_added": null
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              "samsunginternet_android": {
                "version_added": "6.0"
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              "webview_android": {
                "version_added": "56"
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              "standard_track": true,
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          }
        }
      },
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/screenY",
          "support": {
            "chrome": {
              "version_added": true
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            "chrome_android": {
              "version_added": true
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              "version_added": "12"
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            "firefox": {
              "version_added": true
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            "firefox_android": {
              "version_added": true
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
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        },
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            "description": "Value type changed from <code>long</code> to <code>double</code>",
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              "chrome": {
                "version_added": "56"
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              "chrome_android": {
                "version_added": "56"
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              "edge": {
                "version_added": "≤79"
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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                "version_added": null
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              "samsunginternet_android": {
                "version_added": "6.0"
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              "webview_android": {
                "version_added": "56"
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              "experimental": false,
              "standard_track": true,
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/shiftKey",
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            "chrome": {
              "version_added": true
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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
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            "ie": {
              "version_added": true
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            "opera": {
              "version_added": true
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            "opera_android": {
              "version_added": true
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            "safari": {
              "version_added": true
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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          },
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            "experimental": false,
            "standard_track": true,
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/which",
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              "version_added": "1"
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              "version_added": true
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              "version_added": "12"
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              "version_added": "1",
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            "firefox_android": {
              "version_added": "4",
              "notes": "On <code>mousemove</code> events, the <code>which</code> property is incorrectly always set to <code>1</code>."
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": "10.6"
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            "opera_android": {
              "version_added": "11"
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              "version_added": "3.1"
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            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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          },
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/x",
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            "chrome": {
              "version_added": true
            },
            "chrome_android": {
              "version_added": true
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            "edge": {
              "version_added": "12"
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            "firefox": {
              "version_added": "53"
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            "firefox_android": {
              "version_added": "53"
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              "version_added": "9"
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            "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
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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          },
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            "standard_track": true,
            "deprecated": false
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/y",
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            "chrome": {
              "version_added": true
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            "chrome_android": {
              "version_added": true
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            "edge": {
              "version_added": "12"
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            "firefox": {
              "version_added": "53"
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            "firefox_android": {
              "version_added": "53"
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            "ie": {
              "version_added": "9"
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            "opera": {
              "version_added": true
            },
            "opera_android": {
              "version_added": true
            },
            "safari": {
              "version_added": true
            },
            "safari_ios": {
              "version_added": true
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            "samsunginternet_android": {
              "version_added": true
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            "webview_android": {
              "version_added": true
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          },
          "status": {
            "experimental": true,
            "standard_track": true,
            "deprecated": false
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}