Html template code: <button type="button" style="width:80%;">asasas</button>%
It will be output by mustache as following: <button type="button" style="width:80%!;(MISSING)">asasas</button>%!(NOVERB)
It's unexpected, How to fixed it?
Honestly that looks like a bug in the library, since printf-like % specifiers aren't part of the mustache language, but most likely the way to get a % in the output is to use %% in the template.