For those of you concerned about making your documents accessible to older browsers, there is an important warning to be made. You're probably aware that browsers ignore tags they don't recognize; for example, if a web page contains a BLOOPER tag, browsers will completely ignore the tag because it isn't a tag they recognize.

The same will be true with style sheets. If a browser does not recognize <STYLE> and Book HomeCascading Style Sheets: The Definitive GuideSearch this book Wednesday 28th of June 2017 07:19:47 AM


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keywords. They have the effects you'd expect from their names;for example, top right wouldcause the background image to be placed in the top right corner ofthe element. Let's go back to the small yin-yang symbol:

BODY {background-image: url(yinyang.gif);background-repeat: no-repeat;background-position: top right;}

Incidentally, the result, shown in Figure 6-37,would have been exactly the same had the position been declared as

Users could then pick the style they wanted to use, and the browser would switch from the first one (labeled "Default" in this case) to whichever the reader picked. Figure 1-4 shows one way in which this selection mechanism might be accomplished.

Figure 1-4

Figure 1-4. A browser offering alternate style sheet selection

WARNING

Alternate styles sheets are only supported by one browser as of this writing -- Internet Explorer for Macintosh -- and that onlythe :first-letter pseudo-element. The style wouldlook something like this:

P.intro:first-letter {font-size: 300%; font-weight: bold; float: left;width: 1em;}

This will result in approximately what is seen in Figure 11-22.

However, as you probably know, older browsers don't support the:first-letter pseudo-element. In many ofthese -- Internet Explorer 3.x and Navigator 4.x, forif a variant labeled "Medium" is the only variantavailable, it is not assigned to500.

A user agent has to do even more work if there are less than nineweights in a given font family. In this case, it has to fill in thegaps in a predetermined way: