<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-align-3/#baseline-rules">
<style>
#target {
  display: grid;
  grid-template: 50px 50px 50px 50px / 50px 50px 50px;
  width: 200px;
  border: solid 3px;
  position: relative;
  line-height: 20px;
}
#target > div {
  writing-mode: vertical-rl;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('#target > div')">

<div id="target">
  <div style="grid-row: 1; grid-column: 3; justify-self: baseline; margin-right: 10px;" data-offset-x="100">line1<br>line2</div>
  <div style="grid-row: 2; grid-column: span 3; justify-self: baseline;" data-offset-x="100">line1<br>line2</div>
  <div style="grid-row: 3; grid-column: 1; justify-self: last baseline; margin-left: 10px;" data-offset-x="10">line1<br>line2</div>
  <div style="grid-row: 4; grid-column: span 3; justify-self: last baseline;" data-offset-x="10">line1<br>line2</div>
</div>
