<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-align-3/#baseline-rules">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#alignment">
<style>
#target {
display: grid;
grid-auto-flow: column;
grid-template-rows: 120px;
align-items: last baseline;
width: 200px;
border: solid 3px;
position: relative;
line-height: 0;
}
span {
display: inline-block;
width: 1em;
height: 1em;
outline: solid cornflowerblue 3px;
outline-offset: -3px;
}
#target > div {
flex: none;
}
#target > :nth-child(1) {
background: lime;
margin-bottom: 20px;
padding-bottom: 20px;
font-size: 20px;
}
#target > :nth-child(2) {
background: hotpink;
font-size: 30px;
}
#target > :nth-child(3) {
background: papayawhip;
font-size: 10px;
writing-mode: vertical-lr;
}
</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 data-offset-y="40"><span></span><br><span></span></div>
<div data-offset-y="20"><span></span><br><span></span></div>
<div data-offset-y="70"><span></span><br><span></span></div>
</div>