<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <html> <meta charset="utf-8"> <title>CSS Flexbox Test Reference: Fragmentation of single-line column flex container</title> <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com"> <link rel="author" title="Mozilla" href="http://www.mozilla.org/"> <style> html { writing-mode: vertical-rl; } .multicol { block-size: 50px; inline-size: 190px; column-width: 40px; column-fill: auto; column-gap: 10px; border: 5px solid orange; margin-block-end: 5px; /* Just to separate each sub-testcase visually. */ padding-block: 15px; } .flexContainer { background: gray; box-decoration-break: clone; } .gap { block-size: 5px; } /* Note: flex items are in visual order as "CMYK": cyan, magenta, yellow, black. */ header { background: cyan; block-size: 50px; } nav, article, footer { inline-size: 30px; } nav { background: magenta; block-size: 25px; } article { background: yellow; block-size: 25px; position: relative; inset-inline-start: 5px; } footer { background: black; block-size: 50px; position: relative; inset-inline-start: 10px; } </style> <body> <!-- Test a container with margin-block-start. --> <div class="multicol"> <div class="flexContainer" style="margin-block-start: 25px"> <header></header><nav></nav><article></article><footer></footer> </div> </div> <!-- Test a container not at the top of the column/page. --> <div class="multicol"> <div style="block-size: 25px"></div> <div class="flexContainer"> <header></header><nav></nav><article></article><footer></footer> </div> </div> <!-- Test a container with row-gap. --> <div class="multicol"> <div class="flexContainer"> <header></header><div class="gap"></div><nav></nav><div class="gap"></div><article></article><div class="gap"></div><footer></footer> </div> </div> </body> </html>