Here is a minor bug: it doesn't seem to be possible to insert a special character (© or ¨ for the copyright sign) into page headers or footers.

In CSS strings you can use \169 to select the copyright character, or paste it directly in UTF-8.

Ah, I found that \169 produces the latin small u with tilde, i.e. U+0169, not the copyright sign. But it turns out that \A9 works fine (as does UTF-8).

Oops, yes sorry, I mixed up decimal and hexadecimal there.