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In contrast to vertical formatting, horizontal formatting can get a little complicated. Fortunately, it starts out simply enough; it's only when you start putting things together that the situation becomes difficult.
First off, the simplest rule is this: unlike vertical margins, border="0" alt="Library Navigation Links" >
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If an external style sheet is sent using the wrong MIME type, the style sheet gets mangled into something unusable. If you find that you're having this problem, then you'll need to contact your ISP and explain the problem. If they refuse to fix it, try explaining to them that IANA (the Internet Assigned Numbers Authority, which also approves MIME types) has approved .css as the extension for the MIME type text/css, and the slideshow mapping is not a recognized IANA MIME type. As Figure 4-15 shows, justified text is formatted such that the ends of each line of text are placed at the inner edge of the parent element. This is accomplished by changing the spacing between words and letters so that each line is precisely the same length. This is an effect common to the print world (such as in this book), but under CSS, some extra considerations come into play.
CSS does not specify how justified text should be "stretched out" to fill the space between the left and right edges of the