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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body { margin: 0; padding: 0; font-size: 0; line-height: 0 }
.grid {
background: gray;
display: inline grid;
vertical-align: top;
grid-template-columns: 100px;
height: 100px;
}
.subgrid {
box-sizing: border-box;
margin: 10px;
padding: 10px;
display: grid;
background: orangered;
border: blue solid 10px;
grid-template-columns: subgrid;
height: 80px;
}
.subgrid > .item {
background: orange;
width: 40px;
height: 40px;
}
.js { justify-self: start }
.je { justify-self: end }
.jc { justify-self: center }
.jb { justify-self: baseline }
</style>
<p>Test passes if there are four orange squares in a column.</p>
<div class="grid"><div class="subgrid js"><div class="item"></div></div></div><br>
<div class="grid"><div class="subgrid je"><div class="item"></div></div></div><br>
<div class="grid"><div class="subgrid jc"><div class="item"></div></div></div><br>
<div class="grid"><div class="subgrid jb"><div class="item"></div></div></div>