autoprefixer/test/cases/writing-mode.css

.one {
  writing-mode: horizontal-tb;
}
.two {
  writing-mode: vertical-rl;
}
.three {
  writing-mode: vertical-lr;
}
.rtl-vertical-rl {
  writing-mode: vertical-rl;
  direction: rtl;
}
.rtl-vertical-lr {
  writing-mode: vertical-lr;
  direction: rtl;
}
.rtl-horizontal-tb {
  writing-mode: horizontal-tb;
  direction: rtl;
}
.rtl-horizontal-tb-override-direction {
  writing-mode: horizontal-tb;
  direction: rtl;
  direction: ltr;
}