<p>Are there any useful techniques for reducing the repetition of constants in a CSS file?</p>

<p>(For example, a bunch of different selectors which should all apply the same colour, or the same font size)?</p>

You can use multiple inheritance in your html elements (e.g.
```
<div class="one two">
```
) but I'm not aware of a way of having constants in the CSS files themselves.
This link (the first found when googling your question) seems to have a fairly indepth look at the issue:
http://icant.co.uk/articles/cssconstants/