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<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<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">
<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>