<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <html> <head> <title>CSS Reftest Reference</title> <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"> <meta charset="utf-8"> <style> .flexContainer { display: flex; flex-wrap: wrap; align-content: stretch; /* Initial value; just here for emphasis */ width: 25px; height: 60px; background: yellow; border: 1px dotted black; float: left; margin: 5px; } .collapsedItem { width: 0; height: 40px; } .shortItem { width: 25px; height: 10px; background: purple; } .tallItem { width: 10px; height: 30px; background: olive; } </style> </head> <body> <div class="flexContainer"> <div class="shortItem"></div> <div class="collapsedItem"></div> <div class="tallItem"></div> </div> </body> </html>