docs: function hashSelectorContent() {
      var content = '';
      outer: while (!source.isAtEnd()) {
        var token = source.first();
  
        switch (token) {
          case '}':
            source.shift();
            break outer;
  
          case '/':
            cssComment();
            break;
          case "'":
            singleQuoteString();
            break;
          case '"':
            doubleQuoteString();
            break;
          default:
            content += source.shift();
        }
      }
  
      var bareContent = content.replace(/\s|;/g, '');
      return stringHash(bareContent);
    }