> I think maybe CSS shouldn't change the Dom.
They're not really changing the DOM (at least not IMO). You can't add tags and
structure to the HTML with CSS - you can only change the value of text nodes
(and then, only by adding to them).
>Just trying to understand why they are there.
So you can put presentational characters in your display. For example, perhaps
you have a table full of financial data. And on one page, you want negative
numbers to be displayed with a - sign, but in another page, you want the same
numbers displayed in parentheses. Data hasn't changed - just the presentation.
<span class="negative">200</span>
With css for one page
.negative:before {content: '-'}
And for the other page,
.negative:before {content: '(';}
.negative:after {content: ')';}
---Tim
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