Index_U

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U

<u> (underline) element, 81-82

applying to HTML documents, 93

confusion caused by, 82

overview of, 728-729

using, 93

<ul> (unordered list) element

contents of, 20

example of, 72-74, 76

overview of, 729-731

&uml; (umlaut) HTML character entity, description of, 800

umlaut accents, HTML character entities for, 802-807

UNIX systems

fonts for, 824-825

pros and cons of, 505

unselectable attribute, overview of, 582

Unvisited link state, explanation of, 112

URCs (uniform resource characteristics), overview of, 135-136

uri value of cursor property in CSS2, explanation of, 349

URIs (uniform resource identifiers), overview of, 136

URL-address components

directories, 96-98

filenames, 97-99

protocols, 98-99

site address, 94-96

URL schemes Web address, 137

URLs (uniform resource locators). See also Web sites

avoiding characters used with, 100

cleaning up, 136

emerging forms for, 136-137

and encoding, 100

explanation of, 91, 94

file URLs, 104-105

formula for creation of, 102-107

and fragments , 100

FTP URLs, 105-106

HTTP URLs, 102-104

javascript:, 445

mailto URLs, 106-107

and port numbers , 99

problems with, 134

and query strings, 100-101

relative URLs, 108-109

removing extensions from, 541

special-character encoding in, 104

structure of, 94

syntax of, 102

telnet URLs, 107

usernames and passwords used with, 99

URNs (uniform resource names ), overview of, 135

.us code, meaning of, 95

usemap attribute

example of, 125

using with client-side image maps, 121, 165

user acceptance testing, performing for Web site projects, 51

user preferences

integrating with colors in CSS2, 351-352

integrating with fonts in CSS2, 352-353

user style sheets, overview of, 348-349

usernames and passwords, using with URLs, 99

users, understanding expectations and needs of, 31-33

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