text: var s1 = "line 1\
  line2\
  line3\
  line4";
  var s2 = 'line 1\
  line2\
  line3\
  line4';
  var s3 = "line 1";
  var s4 = 'line 1';
  var s5 = "\u1234";
  var s6 = '\x12';
  var s7 = 'double " quotes';
  var s8 = "single ' quote";
  var s9 = '\'';
  var s10 = "\"";
  var s11 = "\b\0\n\t\f\r\v\\\251\"\'";
  var s12 = '\b\0\n\t\f\r\v\\\251\"\'';