UIEvent: [DOM]
undefined: [Core]
unescape: [Core]
unicodeBidi: CSS2Properties[DOM]
UNKNOWN_RULE: CSSRule[DOM]
UNLOAD: Event[Client]
unshift: Array[Core]
URIError: [Core]
URL: [Client], Document[Client], HTMLDocument[DOM]
useMap: HTMLInputElement[DOM]
userAgent: Navigator[Client]
userLanguage: Navigator[Client]
UTC: Date[Core]
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