<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Flexbox Test: gap - vertical with LR vertical writing mode</title> <link rel="author" title="Adam Argyle" href="mailto:argyle@google.com"> <style> body { writing-mode: vertical-lr; } section { background-color: green; block-size: 200px; display: flex; flex-direction: column; } section > div{ background-color: gray; flex: 1 1 auto; } section > div:not(:first-child) { margin-block-start: 20px; } </style> <body> <p>Test passes if there is <strong>a green vertical line between boxes</strong>.</p> <section> <div></div> <div></div> <div></div> </section> </body>