... 340–341 of XHTML pages, 341–344 WWW. See World Wide Web X XHTML and HTML, 41 lowercasing of tags in, 25, 41 unpaired tags in, formatting of 25, 41 XML (eXtensible Markup Language), 41 and RSS, ... violated at AOL’s Web site, 324 at Firstgov.gov Web site, 326–327 at Google’s Web site, 324 at Intuitive Systems’s Web site, 331 at the MSN Web site, 324 at Open Directory Project Web site, 332 ... 404ŁIndex404 Web files (continued) integration of links and text in, 107 kerning in, using CSS, 72 keyboard shortcuts in, 230 leading in, adjusting with CSS, 73–74 letter spacing in, adjusting with...