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U

unary operators : Number of Operands new Data Type Wrapper Objects Object Creation Operator (new) Creating New Objects with Constructors Creating Arrays typeof Undefined The typeof Operator typeof operator : Conversions to Objects typeof operators : Core Language Changes void The void Operator JavaScript in URLs - (negation) : Unary Negation (-)
undefined (value) Undefined Undefined Object Properties converting Conversions to Strings Conversions to Numbers Conversions to booleans Conversions to Objects
unescape() Reading Cookies unescape()
Unix platforms : Window.open() method browser background color : Document Properties data tainting on : Enabling Data Tainting in Navigator 3.0 window size and : Window Size on Unix Platforms
unnamed functions : The Function() Constructor
untaint() JavaScript Security The taint() and untaint() Functions untaint()
untyped variables : Untyped Variables
URL object URL URL.hash URL.host URL.hostname URL.href URL.pathname URL.port URL.protocol URL.search
URL property Miscellaneous Changes Document Properties Document.URL
URL protocol specifiers javascript: Exploring JavaScript JavaScript URL Execution mailto: Security Holes and Security Hobbles Security Hobbles in Navigator 3.0
URLs Document.URL about:cache : Security Holes and Security Hobbles extracting information from : The Location Object javascript: protocol specifier : JavaScript in URLs referral : Document Properties
Usenet, JavaScript newsgroups : Discussion of JavaScript
User-Agent header : Compatibility Through CGI Scripts
userAgent property The Navigator, MimeType, and Plugin... Compatibility Through CGI Scripts Navigator.userAgent
users (see input) input from (see input) interacting with Interact with the User Using the Java System Classes notifying of browser incompatibility : Notifying Users of Old Browsers