Book HomeCascading Style Sheets: The Definitive GuideSearch this book Wednesday 13th of December 2017 08:03:43 PM

10.5. Adapting to the Environment

CSS2 offers the ability to both alter the browser's environment and integrate its look more closely to that of the user's operating system.

10.5.1. Cursors

To achieve the former, we have the cursor property, which lets you declare what shape the browser's cursor will take as it passes over a given element. Want to make a humorous point about download times? Change the cursor to the wait cursor (an hourglass or watch) when the cursor passes over hyperlinks. You can even hook this property up to "cursor files" (which are not defined by the specification), so you could theoretically class your anchors based on where they go and load different icons for each type of link. For example, off-site links could cause the cursor to change into a globe, while links intended to provide help could trigger a question-mark cursor.

10.5.2. Colors

In order to let web pages more closely match the user's desktop environment, there are a whole list of new color keywords like button-highlight, three-d-shadow, and gray-text. These are all intended to use the colors of the user's that the default value of none will be used. As we've seen, that will turn the border off altogether.

7.4.4.1. Setting borders as quickly as possible

With all of this shorthand stuff, you're probably starting to suspect that it goes even further, and you're right. We finally come to the shortest shorthand border property of all: border.

operating system. In all, there are 27 of these new color keywords. I won't list them all out here, but they're listed in Table 10-1, found at the end of this chapter.

10.5.3. Outlines

While you're moving your cursor around, you might want to show where the focus is set. For example, it might be nice to define a button so that it gets a red box around it when the cursor moves over it. Well, there a number of outline properties, including outline, outline-color, outline-style, and outline-width. To use the example of a red box, you might declare:

IMG.button:hover {outline: solid red 1px;}

This should have the effect described. The outline styles could also be used to set a visible outline for regions in a client-side image map.



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image is placed inside a DIV that has no padding,borders, or margins. The result will be as shown in Figure 7-70.

Figure 7-70

Figure 7-70. A floating image with negative top and left margins

The math in this situation works out something like this: assume thetop inner edge of the DIV is at the pixel position100. The browser, in order to figure out where the top inner edge ofthe floated element should be will do this: 100px+ (-15px)margin + 0