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Appendix B. HTML 2.0 Style Sheet

The style sheet provided in this chapter was excerpted from the CSS1 specification and is included here to give authors an idea of how legacy browser behavior in handling HTML can be reproduced, or at least approximated, using CSS1 rules. A thorough understanding of this style sheet is a good first step to understanding how CSS1 operates. The simpler HTML 2.0 style sheet is reproduced here in order to minimize complexity and possible confusion. A suggested style sheet for HTML 3.2 is also available on the W3C web site, as part of the CSS2 specification.

This HTML 2.0 style sheet was written by Todd Fahrner, in accordance with the suggested rendering in the HTML 2.0 specification:

 BODY {
margin: 1em;
font-family: serif;
line-height: 1.1;
background: white;
color: black;
}
H1, H2, H3, H4, H5, H6, P, UL, OL, DIR, MENU, DIV,
DT, DD, ADDRESS, BLOCKQUOTE, PRE, BR, HR { display: block }
Figure 6-19

Figure 6-19. The results of a simple style sheet

This style sheet is more sophisticated (shown in Figure 6-20):

BODY {color: black; background-color: white;}P {color: #333;}PRE, CODE, TT {color: rgb(50%,50%,50%); background-color: #FFFFCC;}A:link {color: blue; background-color: yellow;}A:visited {color: navy; background-color: white;}
Figure 6-20

Figure 6-20. The results of a more sophisticated style sheet

This is but the tiniest beginning of what's possible, of B, STRONG, I, EM, CITE, VAR, TT, CODE, KBD, SAMP, IMG, SPAN { display: inline } LI { display: list-item } H1, H2, H3, H4 { margin-top: 1em; margin-bottom: 1em } H5, H6 { margin-top: 1em } H1 { text-align: center } H1, H2, H4, H6 { font-weight: bold } H3, H5 { font-style: italic } H1 { font-size: xx-large } H2 { font-size: x-large } H3 { font-size: large } B, STRONG { font-weight: bolder } /* relative to the parent */ I, CITE, EM, VAR, ADDRESS, BLOCKQUOTE { font-style: italic } PRE, TT, CODE, KBD, SAMP { font-family: monospace } PRE { white-space: pre } ADDRESS { margin-left: 3em } BLOCKQUOTE { margin-left: 3em; margin-right: 3em } UL, DIR { list-style: disc } OL { list-style: decimal } MENU { margin: 0 } /* tight formatting */ LI { margin-left: 3em } DT { margin-bottom: 0 } DD { margin-top: 0; margin-left: 3em } HR { border-top: solid } /* 'border-bottom' could also have been used */ A:link { color: blue } /* unvisited link */ A:visited { color: red } /* visited links */ A:active { color: lime } /* active links */ /* setting the anchor border around IMG elements requires contextual selectors */ A:link IMG { border: 2px solid blue } A:visited IMG { border: 2px solid red } A:active IMG { border: 2px solid lime }



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Let's take another example: one where we want all of the margins to be auto -- except for the left margin, which should be 3em :

H2 {margin-left: 3em;}

margin-left is one of four properties devoted to setting the margins on each of the four sides of an element box. Their names should come as little surprise.