<!DOCTYPE html> <html> <meta charset="utf-8"> <title>Tests un-fragmentable flex item is pushed to the next column without overflowing the flex container.</title> <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com"> <link rel="author" title="Mozilla" href="https://www.mozilla.org/"> <link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination"> <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1743890"> <link rel="match" href="../../reference/ref-filled-green-100px-square.xht"> <style> .multicol { column-count: 4; column-gap: 0; column-fill: auto; background: red; width: 100px; height: 100px; } .multicol > div { background: green; } .flexbox { display: flex; flex-direction: column; height: 280px; justify-content: space-between; border: 5px solid green; } .flexbox > div { contain: size; width: 15px; height: 40px; } </style> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div class="multicol"> <!-- This div makes the flexbox not at the top of first column. --> <div style="width: 100%; height: 50px;"></div> <div class="flexbox"> <div></div> <div></div> </div> <div style="width: 100%; height: 60px;"></div> </div> </html>