{
  "api": {
    "MouseEvent": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent",
        "spec_url": [
          "https://w3c.github.io/uievents/#interface-mouseevent",
          "https://drafts.csswg.org/cssom-view/#extensions-to-the-mouseevent-interface",
          "https://w3c.github.io/pointerlock/#extensions-to-the-mouseevent-interface"
        ],
        "tags": [
          "web-features:mouse-events"
        ],
        "support": {
          "chrome": {
            "version_added": "1"
          },
          "chrome_android": "mirror",
          "edge": {
            "version_added": "12"
          },
          "firefox": {
            "version_added": "1"
          },
          "firefox_android": "mirror",
          "ie": {
            "version_added": "9"
          },
          "oculus": "mirror",
          "opera": {
            "version_added": "10.6"
          },
          "opera_android": {
            "version_added": "11"
          },
          "safari": {
            "version_added": "1"
          },
          "safari_ios": "mirror",
          "samsunginternet_android": "mirror",
          "webview_android": "mirror",
          "webview_ios": "mirror"
        },
        "status": {
          "experimental": false,
          "standard_track": true,
          "deprecated": false
        }
      },
      "MouseEvent": {
        "__compat": {
          "description": "`MouseEvent()` constructor",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/MouseEvent",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-mouseevent",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "26"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "11"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "7"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "altKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/altKey",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-altkey",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "button": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/button",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-button",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "buttons": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/buttons",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-buttons",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "43"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "15",
              "notes": "Restrictions apply depending on OS."
            },
            "firefox_android": {
              "version_added": "15"
            },
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "11.1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "clientX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/clientX",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-clientx",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "10.6"
            },
            "opera_android": {
              "version_added": "11"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "clientY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/clientY",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-clienty",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "ctrlKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/ctrlKey",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-ctrlkey",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getModifierState": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/getModifierState",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-getmodifierstate",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "47"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "15"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "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
          }
        },
        "accel_support": {
          "__compat": {
            "description": "`\"Accel\"` parameter",
            "support": {
              "chrome": {
                "version_added": false
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "32"
              },
              "firefox_android": "mirror",
              "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": true
            }
          }
        }
      },
      "initMouseEvent": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/initMouseEvent",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-initmouseevent",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
      },
      "layerX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/layerX",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": false,
            "deprecated": false
          }
        }
      },
      "layerY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/layerY",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": false,
            "deprecated": false
          }
        }
      },
      "metaKey": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/metaKey",
          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-metakey",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "movementX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/movementX",
          "spec_url": "https://w3c.github.io/pointerlock/#dom-mouseevent-movementx",
          "tags": [
            "web-features:pointer-lock",
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "37"
              },
              {
                "prefix": "webkit",
                "version_added": "22",
                "version_removed": "37"
              }
            ],
            "chrome_android": {
              "version_added": false,
              "impl_url": "https://crbug.com/40290045"
            },
            "edge": {
              "version_added": "13"
            },
            "firefox": [
              {
                "version_added": "41"
              },
              {
                "prefix": "moz",
                "version_added": "1",
                "version_removed": "41"
              }
            ],
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": [
              {
                "version_added": "9"
              },
              {
                "prefix": "webkit",
                "version_added": "6",
                "version_removed": "8"
              }
            ],
            "safari_ios": {
              "version_added": "17"
            },
            "samsunginternet_android": [
              {
                "version_added": "3.0"
              },
              {
                "prefix": "webkit",
                "version_added": "1.0",
                "version_removed": "3.0"
              }
            ],
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "movementY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/movementY",
          "spec_url": "https://w3c.github.io/pointerlock/#dom-mouseevent-movementy",
          "tags": [
            "web-features:pointer-lock",
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "37"
              },
              {
                "prefix": "webkit",
                "version_added": "22",
                "version_removed": "37"
              }
            ],
            "chrome_android": {
              "version_added": false,
              "impl_url": "https://crbug.com/40290045"
            },
            "edge": {
              "version_added": "13"
            },
            "firefox": [
              {
                "version_added": "41"
              },
              {
                "prefix": "moz",
                "version_added": "1",
                "version_removed": "41"
              }
            ],
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": [
              {
                "version_added": "9"
              },
              {
                "prefix": "webkit",
                "version_added": "6",
                "version_removed": "8"
              }
            ],
            "safari_ios": {
              "version_added": "17"
            },
            "samsunginternet_android": [
              {
                "version_added": "3.0"
              },
              {
                "prefix": "webkit",
                "version_added": "1.0",
                "version_removed": "3.0"
              }
            ],
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "offsetX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/offsetX",
          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-offsetx",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "39"
            },
            "firefox_android": {
              "version_added": "43"
            },
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "offsetY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/offsetY",
          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-offsety",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "39"
            },
            "firefox_android": {
              "version_added": "43"
            },
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "pageX": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/pageX",
          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-pagex",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "1.5"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "≤12.1"
            },
            "opera_android": {
              "version_added": "≤12.1"
            },
            "safari": {
              "version_added": "1"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "pageY": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/MouseEvent/pageY",
          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-pagey",
          "tags": [
            "web-features:mouse-events"
          ],
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
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              "version_added": "≤12.1"
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            "standard_track": true,
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              "version_added": "≤12.1"
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              "version_added": "1"
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            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
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            "description": "Available on `DragEvent`",
            "spec_url": "https://html.spec.whatwg.org/multipage/dnd.html#:~:text=relatedtarget",
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              "chrome": {
                "version_added": "60"
              },
              "chrome_android": "mirror",
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                "version_added": "59"
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              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
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                "impl_url": "https://webkit.org/b/66547"
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            "status": {
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              "standard_track": true,
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          }
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      "screenX": {
        "__compat": {
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          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-screenx",
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            "web-features:mouse-events"
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              "version_added": "1"
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          "status": {
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            "standard_track": true,
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            "web-features:mouse-events"
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              "version_added": "1"
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      "shiftKey": {
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          "spec_url": "https://w3c.github.io/uievents/#dom-mouseevent-shiftkey",
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            "web-features:mouse-events"
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            "standard_track": true,
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        }
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      "x": {
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          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-x",
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            "web-features:mouse-events"
          ],
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            "standard_track": true,
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        }
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          "spec_url": "https://drafts.csswg.org/cssom-view/#dom-mouseevent-y",
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            "web-features:mouse-events"
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          },
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            "standard_track": true,
            "deprecated": false
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        }
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    }
  }
}