 
0.2. Conventions Used in This Book
The following typographical conventions are used in this book:
-  Constant width
- 
Indicates headers, directives, attributes, code examples, and HTML
tags.
- Constant width italic
- 
Indicates variables in examples that should be replaced with
user-supplied values.
- Italic
- 
Indicates variables, filenames, directory names, URLs, and comments
in examples.
- Bold
- 
Indicates buttons and keys.
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| Preface |  | 0.3. Comments and Questions | 
 
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