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THE CONTEXT OF THE BOOK'S EXAMPLESAll of the examples assume a basic page structure that surrounds them. In other words, what is shown in each chapter in terms of XHTML and CSS code happens within an assumed, existin78 document in between the <body> and </body>. For instance, the basic framework for the book's examples could be set up like this:
How to validate" section of Chapter 6. |
While the CSS is placed in the <head> of the page for convenience, it should eventually be hidden from old, tired browsers (Netscape Navigator 4.x, for example). This hiding is quite common, enabling designers to use advanced CSS for layout (as we do throughout the book), while offering older browsers that can't handle it a fully readable, CSS-free view of the document.
Hiding CSS from older browsers is commonly done by using the @import method for referencing external style sheets. For example, if we placed all of our styles into a file named screen.css, we could use the @import method to reference that external style sheet by its URL. Because older browsers (like Netscape 4.x) don't understand @import, the styles contained within screen.css will be hidden to them.
<head>
<title>Page Title</title>
<meta http-equiv="Content-Type" content="tex91; charset=utf-8" />
<style type="text/css">
@import url("screen.css");
</style>
</head>
