code: func lexCss(l *lexer) stateFn {
  	l.next()
  	l.ignore()
  	for l.next() != '}' {
  	}
  	l.backup()
  	l.emit(itemText)
  	l.next()
  	if l.doubleDelim && l.next() != '}' {
  		return l.errorf("expected double closing braces in tag")
  	}
  	l.emit(itemRightDelim)
  	return lexText
  }
docs: // lexCss scans the body of the {css} command into an itemText.
  // This is required because css classes are unquoted and may have hyphens (and
  // thus are not recognized as idents).
  // itemCss has already been emitted