There are Unicode characters for a few fractions, such as ½. This looks a little better than 1/2, depending on the context.
Here’s the Taylor series for log(1 + x) written in pure HTML:
log(1 + x) = x – ½x² + ⅓x³ – ¼x⁴ + ⅕x⁵ – ⋯
See this post for how the exponents were made.
Notice that the three dots ⋯ on the end are centered vertically, like
\cdots in LaTeX. This was done with
The selection of available fraction number forms is small and a little strange.
There are characters for fractions with denominator d equal to 2, 3, 4, 5, 6, and 8, with numerators 1 through d-1, except for fractions that can be reduced.
If d = 7, 9, or 10, there’s a character for 1/d but not for fractions with numerators other than 1. For example, there is a character for ⅐ but not for 2/7.
For denominators 2, 3, 4, 5, 6, and 8 the HTML entity for characters is easy: they all have the form
& frac <n> <d> ;
where n is the numerator and d is the denominator. For example,
⅗ is the HTML entity for ⅗.
There are no HTML entities for 1/7, 1/9, or 1/10.