Chapter 39. Using Background Images on Web Pages
There are two ways to add a background image to a Web page. One is to use HTML attributes. The other is to use CSS style definitions. With HTML, you get limited design options but solid reliability across browsers. With CSS, you get more design options but less reliability.
Beware of background images that overwhelm the content of the page. Stick to washed-out images that don't interfere with the legibility and clarity of your text.
In HTML, you add the background attribute to the body tag, like this:
The browser tiles or repeats the image across all available real estate in the browser window, as in Figure 39.1.