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+<!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: Fragmentation of block-size:auto single-line row flex container with fixed block-size flex items</title>
+ <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+ <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+ <link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
+ <link rel="match" href="flexbox-single-row-vertical-lr-1-ref.html">
+ <meta name="assert" content="This test verifies fragmentation of fixed block-size flex items in a block-size:auto single-line row flex container, with various combinations of margin/border/padding, alignments, and column-gap. Also use a script to shrink multicol block-size.">
+
+ <style>
+ html {
+ writing-mode: vertical-lr;
+ }
+ .multicol {
+ block-size: 80px;
+ 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 {
+ display: flex;
+ flex-wrap: nowrap;
+ flex-direction: row;
+ background: gray;
+ /* border-width is 0 by default; some sub-testcases will increase it. */
+ border: 0 solid lightgray;
+ }
+ .border-padding {
+ border-block-width: 10px;
+ padding-block: 5px;
+ }
+
+ /* Note: flex items are in visual order as "CMYK": cyan, magenta, yellow, black. */
+ header, nav, article, footer {
+ flex-grow: 1;
+ }
+ header {
+ background: cyan;
+ block-size: 100px;
+ }
+ nav {
+ background: magenta;
+ block-size: 25px;
+ align-self: flex-start;
+ }
+ article {
+ background: yellow;
+ block-size: 50px;
+ align-self: center;
+ }
+ footer {
+ background: black;
+ block-size: 75px;
+ align-self: flex-end;
+ }
+
+ body.multicol-children-block-size > .multicol {
+ block-size: 50px;
+ }
+ </style>
+
+ <script>
+ function runTest() {
+ document.body.offsetHeight;
+
+ /* Shrink the multicol's block-size to exercise pulling and pushing flex items
+ of an already fragmented flex container. */
+ document.body.classList.add("multicol-children-block-size");
+ }
+ </script>
+
+ <body onload="runTest()">
+ <!-- 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">
+ <header></header><nav></nav><article></article><footer></footer>
+ </div>
+ </div>
+
+ <!-- Test a container with border, padding, and column-gap. -->
+ <div class="multicol">
+ <div class="flexContainer border-padding" style="column-gap: 4px">
+ <header></header><nav></nav><article></article><footer></footer>
+ </div>
+ </div>
+ </body>
+</html>