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I’m pretty sure it’s impossible to do. And why would you want to? Give us some context. What are you trying to do exactly? Is it decorative piece or informative piece of text? Are you worried about readability and legibility?

If it’s a decorative piece maybe use Photoshop to mock up the right solution.

Here are some resources with similar question:
http://stackoverflow.com/questions/11976193/italicize-text-backward