[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] <u> tags <ul> tags 2nd underscoring 2nd unicode-range descriptor uniform resource locators [See URLs]unique identifiers (IDs)articles in newsgroups messages on news servers units attribute (<embed>) units-per-em descriptor universal child selectors unnamed form parameters unordered (bulleted) lists unordered lists bulletedbullet shape list marker style properties nesting using appropriately directory lists unsafe characters in URLs URLs (uniform resource locators) 2nd absolute vs. relative <base> tags character encodings in file URLs form parameters in 2nd ftp URLs generating randomly gopher URLs http URLs JavaScript pseudoprotocol javascript URLs mailto URLs 2nd 3rd defining mail header fields news and nntp URLs query URLs as style property values telnet URLs usemap attribute<img> 2nd 3rd <object> Usenet news system user and password, telnet URLs user-interface design user-related event handlers
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