<!DOCTYPE html>
<link href="resources/grid.css" rel="stylesheet">
<link href="resources/grid-alignment.css" rel="stylesheet">
<style>
body { margin: 0; }
.block {
   background: grey;
   float: left;
   margin: 5px;
   text-orientation: sideways;
}
.block > :nth-child(1) { font-size:24px; }
.block > :nth-child(2) { font-size:32px; }
.block > :nth-child(3) { font-size:48px; }
.block > :nth-child(4) { font-size:64px; }
.item {
   border-width: 2px 5px 3px 4px;
   border-style: solid;
   padding: 6px 3px 7px 8px;
   margin: 10px 6px 4px 12px;
}
.extraBottomPadding { padding-bottom: 30px; }
.row { grid-auto-flow: column; }
</style>

<p>1x4 with parallel items.<br>All items share 'first-row' Baseline Context. No item shares any column-like Baseline Context.<br>Items participate in both, column and row baseline, but since they only share a row-like Baseline Context only 'aling-self' (column baseline-axis) should apply.<br>The Baseline Alignment may increase size contribution of some items.</p>
<div class="block grid row contentStart itemsBaseline">
    <div class="item">A</div>
    <div class="item">A</div>
    <div class="item">A</div>
    <div class="item">A</div>
</div>
<div class="block grid row contentStart itemsBaseline">
    <div class="item extraBottomPadding">A</div>
    <div class="item">A</div>
    <div class="item">A</div>
    <div class="item">A</div>
</div>