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conditional formatting based on odd/even page

I have done conditional formatting (e.g. alternate shading) of lines. However, how can I perform conditional formatting of content based on whether the page is odd or even? For instance, I may want to do a "float: right;" if it is a left page and a float: left;" if it is a right page.

You can use "float: inside" and "float: outside", which are relative to the two page spread.
OK, perhaps I shouldn't have used "float" as the example. What about aligning text left/right depending on the odd/even page?
You could try "text-align: inside" or "text-align-outside". There are several CSS properties that take care of paged styling - use "thinking in spreads" as a starting point.
you can use outside or inside as values of text-align.
Pardon me. I have been using various CSS references which do not have "outside" or "inside". In fact, I don't see those anywhere I look (except this site) but indeed that works. Thanks.
Not in fact a spec yet, but a "living idea": CSS Figures.
Also, Prince has several extensions to CSS, useful for paged media. Paged media CSS is still quite a work in progress, and you'll see that all formatters have their own extensions.