<!DOCTYPE html> <link rel="help" href="https://drafts.csswg.org/css-align-3/#baseline-export"> <link rel="match" href="align-items-baseline-row-vert-ref.html"> <style> #target { writing-mode: vertical-rl; display: flex; align-items: baseline; inline-size: min-content; block-size: 200px; border: solid 3px; } #target > div { margin: 5px 7px 9px 11px; } #target > :nth-child(1) { background: lime; font-size: 30px; writing-mode: vertical-rl; } #target > :nth-child(2) { background: hotpink; font-size: 20px; writing-mode: vertical-rl; } #target > :nth-child(3) { background: cyan; width: 40px; height: 40px; writing-mode: horizontal-tb; } #target > :nth-child(4) { background: lime; font-size: 30px; writing-mode: vertical-lr; } #target > :nth-child(5) { background: hotpink; font-size: 20px; writing-mode: vertical-lr; } </style> <div id="target"> <div>line1<br>line2</div> <div>line1<br>line2</div> <div></div> <div>line1<br>line2</div> <div>line1<br>line2</div> </div>