Book HomeCascading Style Sheets: The Definitive GuideSearch this book Friday 20th of April 2018 04:42:02 PM

10.7. Tables

Perhaps as a result of a generic need to be able to describe table layout -- something CSS1 lacks -- CSS2 includes a handful of features that apply directly to tables and table cells. First, there are 10 new table-related values for display:

table
inline-table
table-column-group
table-column
table-row-group
table-row
table-cell
table-caption
table-header-group
table-footer-group 

While the effects of most of these are obvious from their names, at least two may not be familiar to you. table-header-group and table-footer-group are used to mark the header and footer of a table. These are displayed, respectively, above or below all the rows of the table, but not outside of the table's caption.

Another interesting effect is that you can align text on a character by using the text-align property. For example, if you wanted to line up a column of figures on a decimal point, you might declare:

TD { text-align: "." }

As long as a set of cells are grouped into a column, their content will be aligned so that the periods all line up along a vertical axis.

Far from relying on existing properties, CSS2 provides a whole array

P.warn {color: red;}P.warn A:link {color: green;}

Then you change your mind, deciding that warning text should be grayand that links in such text should be silver. The preceding rulesneed only be changed to reflect the new values:

P.warn {color: gray;}P.warn A:link {color: silver;}

Another use for color is to draw attention to certain types of text.For example, boldfaced text is already fairly of brand-new properties in the table section. Here are a few of them:

There are also properties describing how visibility and vertical-align are applied to tables. There is also a caption-side property, which functions exactly the same as the ALIGN attribute on the <CAPTION> tag, and the property speak-header-cell, which controls how header cells are handled by speech-generating browsers (more on that later).



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for positioning. When you supply lengths for the position of the background image, they are interpreted as offsets from the top left corner of the element. The offset point is the top left corner of the background image; thus, if you set the values 20px 30px , the top left corner of the background image will be 20 pixels to the right of, and 30 pixels below, the top left corner of the containing element, as in Figure 6-43:

BODY {background-image: url(bg23.gif);
background-repeat: no-repeat;