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Cascading Style Sheets: The Definitive GuideSearch this book

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Index: E

element boxes: 7.1. Basic Element Boxes
8.1. Basic Boxes
element clipping: 9.1.4.3. Element clipping
element selectors: 2.1.1. Rule Structure
elements
classification of: 2.9. Classification of Elements
floated (see floated elements)
overlapping, altering: 9.5. Stacking Positioned Elements
styling common: 11.2.4. Styling Common Elements
visibility of: 9.1.5. Element Visibility
elevation property: 10.8.2. The Spoken Word
em box: 5.3. Font Size
em-height (em): 3.2.2.1. em and ex units
em length value: 5.3.3. Percentages and Sizes
em square: 5.3. Font Size
embedded style sheets: 1.4.2. The STYLE Element
ex-height (ex): 3.2.2.1. em and ex units
Extensible Markup Language (see XML)
external style sheets: 1.4.1. The LINK Tag
creating: 11.1.1. Case 1: Consistent Look and Feel
loading
with @import directive: 1.4.3. The @import Directive
with LINK element: 1.4.1. The LINK Tag
extra space around elements, adding: 7.2. Margins or Padding?
7.2. Margins or Padding?
(see also margins)


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These two values are enough to take the place of four. But how?

CSS defines a few steps to accommodate fewer than four values formargin:

The only drawback to this ability is a small one, but you'rebound to run into it eventually. Suppose you want to set the top andleft margins for H1 elements to be 10 pixels, andthe bottom and right margins to be 20 pixels. In that case, you haveto write the following: | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z


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wanted them.

Figure 7-15. More than one single-side margin

However, in this case, it might have been easier to use margin after all:

H2 {margin: 0 0 2em 3em;}

The results will be exactly the same as those we saw before, only with a little bit less typing. In general, once you're trying to set margins for more than one side, it's almost easier to