css/css-layout-api/edges/all-ref.html

<!DOCTYPE html>
<style>
td { text-align: center; }

.parent {
  box-sizing: border-box;
  width: 60px;
  height: 60px;
  border: solid;
  border-width: 1px 2px 3px 4px;
  padding: 0px 4px 8px 12px;
  position: relative;
}

.child {
  position: absolute;
  width: 10px;
  height: 10px;
  background: green;
}

.top-left {
  top: 0;
  left: 12px;
}

.top-right {
  top: 0;
  right: 4px;
}

.bottom-left {
  bottom: 8px;
  left: 12px;
}

.bottom-right {
  bottom: 8px;
  right: 4px;
}
</style>

<table>
  <tr>
    <td></td>
    <td colspan=2>LTR</td>
    <td colspan=2>RTL</td>
  </tr>
  <tr>
    <td></td>
    <td>Y</td>
    <td>X</td>
    <td>Y</td>
    <td>X</td>
  </tr>
  <tr>
    <td>HTB</td>
    <td>
      <div class="parent" style="writing-mode: horizontal-tb; direction: ltr; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: horizontal-tb; direction: ltr; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: horizontal-tb; direction: rtl; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: horizontal-tb; direction: rtl; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
  </tr>
  <tr>
    <td>VRL</td>
    <td>
      <div class="parent" style="writing-mode: vertical-rl; direction: ltr; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-rl; direction: ltr; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-rl; direction: rtl; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-rl; direction: rtl; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
  </tr>
  <tr>
    <td>VLR</td>
    <td>
      <div class="parent" style="writing-mode: vertical-lr; direction: ltr; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-lr; direction: ltr; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-lr; direction: rtl; overflow-y: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
    <td>
      <div class="parent" style="writing-mode: vertical-lr; direction: rtl; overflow-x: scroll;">
        <div class="child top-left"></div>
        <div class="child top-right"></div>
        <div class="child bottom-left"></div>
        <div class="child bottom-right"></div>
      </div>
    </td>
  </tr>
</table>