Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The preceding code snippet initializes a structure by the name of WNDCLASS (or WNDCLASSEX for modern systems) with a necessary template for a window."

A block of code is set as follows:

/* close connection to server */
XCloseDisplay(display);

return 0;
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

/* close connection to server */
XCloseDisplay(display);

return 0;
}

Any command-line input or output is written as follows:

$ mkdir css
$ cd css

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "In Windowing parlance, it is called a message loop."

Warnings or important notes appear like this.

Tips and tricks appear like this.