Gaunt syntax highlighter. Try running it on http://tinysubversions.com/gaunt/

gaunt-prettify.js

var code = document.querySelector('code');
code.innerHTML = code.innerHTML.replace(/\u0020/g, '<span class="s">\u0020</span>')
                               .replace(/\u0009/g, '<span class="t">\u0009</span>');
var styleElem = document.createElement('style');
document.getElementsByTagName('head')[0].appendChild(styleElem);
var stylesheet = document.styleSheets[document.styleSheets.length - 1];
stylesheet.insertRule('.s { background-color: #faf; }', 0);
stylesheet.insertRule('.t { background-color: #afa; }', 1);