<!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 row 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-lr; } .multicol { block-size: 50px; inline-size: 320px; column-count: 3; column-fill: auto; column-gap: 10px; border: 5px solid orange; margin-block-end: 5px; /* Just to separate each sub-testcase visually. */ } .flexContainer { background: gray; /* border-width is 0 by default; some sub-testcases will increase it. */ border: 0 solid lightgray; block-size: 100px; position: relative; } .border-padding { border-block-width: 10px; padding-block: 5px; } .gap { inline-size: 4px; block-size: 100%; } /* Note: flex items are in visual order as "CMYK": cyan, magenta, yellow, black. */ header, nav, article, footer { inline-size: 25px; } header { background: cyan; block-size: 100px; position: absolute; inset-block-start: 0px; } nav { background: magenta; block-size: 25px; position: absolute; inset-block-start: 0px; inset-inline-start: 25px; } article { background: yellow; block-size: 50px; position: absolute; inset-block-start: 25px; inset-inline-start: 50px; } footer { background: black; block-size: 75px; position: absolute; inset-block-start: 25px; inset-inline-start: 75px; } </style> <body> <!-- Basic one without any margin/border/padding. --> <div class="multicol"> <div class="flexContainer"> <header></header><nav></nav><article></article><footer></footer> </div> </div> <!-- 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 border and padding. --> <div class="multicol"> <div class="flexContainer border-padding"> <!-- Adjust top to simulate padding. --> <header style="inset-block-start: 5px"></header><nav style="inset-block-start: 5px"></nav> <article style="inset-block-start: 30px"></article><footer style="inset-block-start: 30px"></footer> </div> </div> <!-- Test a container with border, padding, and column-gap. --> <div class="multicol"> <div class="flexContainer border-padding"> <header style="inline-size: 22px; inset-block-start: 5px"></header> <nav style="inline-size: 22px; inset-block-start: 5px; inset-inline-start: 26px"></nav> <article style="inline-size: 22px; inset-block-start: 30px; inset-inline-start: 52px;"></article> <footer style="inline-size: 22px; inset-block-start: 30px; inset-inline-start: 78px;"></footer> </div> </div> </body> </html>