{"info": {"name": "UI Events Specification", "subsection_number": null, "subsection_name": null, "url": "https://w3c.github.io/uievents/"}, "features": ["CompositionEvent.prototype.initCompositionEvent", "Event.prototype.stopImmediatePropagation", "KeyboardEvent.prototype.getModifierState", "KeyboardEvent.prototype.initKeyEvent", "MouseEvent.prototype.getModifierState", "MouseEvent.prototype.initMouseEvent", "MutationEvent.prototype.initMutationEvent", "UIEvent.prototype.initUIEvent"]}