Classier Fractions with Relative Positioning.

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Here are the fractions you can create with character entities:

¼, ½, ¾.

And here are a few fractions created with some fancy XHTML and CSS handiwork:

⁸/₁₅, ³/₉₄, ⁹/₁₆, ⁴⁴/₄₅, ¹/₉₉.

The differences are minute, meaning you could easily combine character entities when available and relative-positioned fractions when required, and your audience would never be the wiser.