- u -

• UIDelegate : WebView
• Uint32Field : Google.Protobuf.TestProtos.MapWellKnownTypes , Google.Protobuf.TestProtos.OneofWellKnownTypes , Google.Protobuf.TestProtos.RepeatedWellKnownTypes , Google.Protobuf.TestProtos.TestWellKnownTypes
• Uint64Field : Google.Protobuf.TestProtos.MapWellKnownTypes , Google.Protobuf.TestProtos.OneofWellKnownTypes , Google.Protobuf.TestProtos.RepeatedWellKnownTypes , Google.Protobuf.TestProtos.TestWellKnownTypes
• underlayColor : WKView(Private) , WKView
• undoManager : WebView(WebViewEditing)
• uniqueID : IAccessible2
• unknownFields : GPBMessage
• unmaskBytes : SRIOConsumer
• UnpackedBool : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedDouble : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedEnum : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedFixed32 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedFixed64 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedFloat : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedInt32 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedInt64 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedSfixed32 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedSfixed64 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedSint32 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedSint64 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedUint32 : Google.Protobuf.TestProtos.TestUnpackedTypes
• UnpackedUint64 : Google.Protobuf.TestProtos.TestUnpackedTypes
• unparsed_uri : webkitpy.thirdparty.mod_pywebsocket.standalone._StandaloneRequest
• unreachableURL : WebDataSource
• uri : webkitpy.thirdparty.mod_pywebsocket.standalone._StandaloneRequest
• URL : DOMDocument
• url : NEFilterSource(WKLegacyDetails) , SRWebSocket
• URL : WebResource
• urlField : WebViewController
• URLSession : AVAssetResourceLoader(AVAssetResourceLoaderPrivate)
• URLSessionDataDelegate : AVAssetResourceLoader(AVAssetResourceLoaderPrivate)
• URLSessionDataDelegateQueue : AVAssetResourceLoader(AVAssetResourceLoaderPrivate)
• URLString : WebHistoryItem
• urlStrings : RTCIceServer
• useBackCamera : RTCAVFoundationVideoCapturerInternal , RTCAVFoundationVideoSource
• useManualAudio : RTCAudioSession
• useMap : DOMHTMLImageElement , DOMHTMLInputElement , DOMHTMLObjectElement
• usePaginatedMode : SettingsController
• username : RTCIceServer
• userStyleSheetEnabled : WebPreferences
• userStyleSheetLocation : WebPreferences
• userTimingEnabled : WebPreferences(WebPrivate)
• usesGameControllerFramework : SettingsController
• usesPageCache : WebPreferences
• useTransparentWindows : SettingsController
• useUISideCompositing : SettingsController
• useWebKit2ByDefault : SettingsController
• usingUISideCompositing : WKView(Private) , WKView