docs: function() {
      var captures;
  
      if (captures = /^(\w(?:[-:\w]*\w)?)/.exec(this.input)) {
        var tok, name = captures[1], len = captures[0].length;
        this.consume(len);
        tok = this.tok('tag', name);
        this.tokens.push(tok);
        this.incrementColumn(len);
        return true;
      }
    }