div>
    <div class="anchor bl"></div><div class="anchored bl"></div>
    <div class="anchor br"></div><div class="anchored br"></div>
  </div>
</div>

<div class=mix>
  <div class=container style="writing-mode: horizontal-tb; direction: ltr">
    <div class="anchor tl"></div><div class="anchored tl"></div>
    <div class="anchor tr"></div><div class="anchored tr"></div>
    <div class="anchor bl"></div><div class="anchored bl"></div>
    <div class="anchor br"></div><div class="anchored br"></div>
  </div>