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Please explain to me how to type the fraction (a^2+b^2-c^2)/(2ab), which is the simple $\frac{a^2+b^2-c^2}{2ab}$ in TeX, so that the numerator appears above the denominator in HTML. Or any non-TeX layout.

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A div/span with vertical aligment containing 2 divs, of which one has border-bottom or border-top set.

Please give an example of this. What's the markup? It's almost certainly more long winded and harder to read.

Now make it machine-searchable.

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