August 2006
Beginner to intermediate
496 pages
17h 36m
English
Content preview from CSS: The Missing Manual
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The Limits of Inheritance
Inheritance isn't all-powerful. Many CSS properties don't pass down to descendent tags at all. For example, the border property (which lets you draw a box around an element) isn't inherited, and with good reason. If it were, then every tag inside an element with the border property would also have a border around it. For example, if you added a border to the <body> tag, then every bulleted list would also have a box around it, and each bulleted item in the list would also have a border (Figure 4-2).
Tip
There's a complete list of CSS properties in Appendix A, including details on which ones get inherited.
Figure 4-1. Inheritance lets tags copy properties from the tags that surround them. Top: The paragraph tag is set with a specific font-face, size, and color. The tags inside each paragraph inherit those properties so they look like the rest of the paragraph. Bottom: If inheritance didn't exist, the same page would look like this figure. Notice how the strong, em, and a tags inside the paragraph retain the font-face, size, and color defined by the browser. To make them look like the rest of the paragraph, you'd have to create additional styles—a big waste of time.
Figure 4-2. Fortunately, not all properties are inherited. The border applied to the paragraphs ...
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