typedef unsigned long long DOMTimeStamp;
[
Constructor(DOMString type, optional EventInit eventInitDict),
CustomToJSObject,
ExportToWrappedFunction,
Exposed=(Window,Worker),
JSCustomHeader,
] interface Event {
const unsigned short NONE = 0;
const unsigned short CAPTURING_PHASE = 1;
const unsigned short AT_TARGET = 2;
const unsigned short BUBBLING_PHASE = 3;
const unsigned short MOUSEDOWN = 1;
const unsigned short MOUSEUP = 2;
const unsigned short MOUSEOVER = 4;
const unsigned short MOUSEOUT = 8;
const unsigned short MOUSEMOVE = 16;
const unsigned short MOUSEDRAG = 32;
const unsigned short CLICK = 64;
const unsigned short DBLCLICK = 128;
const unsigned short KEYDOWN = 256;
const unsigned short KEYUP = 512;
const unsigned short KEYPRESS = 1024;
const unsigned short DRAGDROP = 2048;
const unsigned short FOCUS = 4096;
const unsigned short BLUR = 8192;
const unsigned short SELECT = 16384;
const unsigned short CHANGE = 32768;
readonly attribute DOMString type;
readonly attribute EventTarget target;
readonly attribute EventTarget currentTarget;
readonly attribute unsigned short eventPhase;
readonly attribute boolean bubbles;
readonly attribute boolean cancelable;
[EnabledAtRuntime=ShadowDOM] readonly attribute boolean composed;
readonly attribute DOMTimeStamp timeStamp;
[EnabledAtRuntime=ShadowDOM] sequence<Node> composedPath();
void stopPropagation();
void preventDefault();
void initEvent(optional DOMString type = "undefined", optional boolean bubbles = false, optional boolean cancelable = false);
readonly attribute boolean defaultPrevented;
void stopImmediatePropagation();
[Unforgeable] readonly attribute boolean isTrusted;
readonly attribute EventTarget srcElement;
[ImplementedAs=legacyReturnValue] attribute boolean returnValue;
attribute boolean cancelBubble;
};