<!DOCTYPE html> <title>CSS Flexbox: min-height: auto with flex items containing percentage-sized children</title> <link rel="author" title="Google LLC" href="https://www.google.com/" /> <link rel="help" href="https://drafts.csswg.org/css-flexbox/#min-size-auto" /> <link rel="match" href="../reference/ref-filled-green-100px-square.xht" /> <link rel="issue" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1003556" /> <style> .flex { display: flex; } .column { flex-direction: column; } .bigger-than-parent { height: 100%; min-height: 100px; background-color: red; } #reference-overlapped-green { position: absolute; background-color: green; width: 100px; height: 100px; z-index: 1; } </style> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div id="reference-overlapped-green"></div> <div id="outer" style="width: 100px; height: 300px;" class="flex"> <div style="height: 100px; width: 100px; background: blue;" class="flex column"> <div style="flex: 0 1 100%"></div> <div style="flex: 1 0 30px;"> <div class="bigger-than-parent"> </div> </div> </div> </div> <script> onload = function() { var outer = document.getElementById("outer"); outer.offsetWidth; outer.style.height = "200px"; }; </script>