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Preface | xv Conventions Used in This Book The following typographical conventions are used in this book: Italic Indicates new terms, URLs, email addresses, filenames, file extensions, path- names, directories, Unix utilities, and general emphasis. Constant width Indicates computer code in a broad sense. This includes commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, meth- ods, modules, properties, parameters, values, objects, events, event handlers, XML tags, HTML tags, macros, the contents of files, and the output from commands. HTTP requests and responses are designated graphically as shown in the following example. GET / HTTP/1.1 is an HTTP request header HTTP/1.1 200 OK is an HTTP response header Code Examples Online examples can be found on this book's companion web site: http://stevesouders.com/hpws Examples are included in each chapter in the context in which they are discussed. They are also listed here for easy review. No Image Map (Chapter 1) http://stevesouders.com/hpws/imagemap-no.php Image Map (Chapter 1) http://stevesouders.com/hpws/imagemap.php CSS Sprites (Chapter 1) http://stevesouders.com/hpws/sprites.php Inline Images (Chapter 1) http://stevesouders.com/hpws/inline-images.php Inline CSS Images (Chapter 1) http://stevesouders.com/hpws/inline-css-images.php Separate Scripts (Chapter 1) http://stevesouders.com/hpws/combo-none.php