<!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-reverse 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-reverse flex container, with various combinations of margin/border/padding, alignments, and column-gap. Also use a script to enlarge multicol block-size.">

  <style>
  html {
    writing-mode: vertical-lr;
  }
  .multicol {
    block-size: 30px;
    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-reverse;
    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. */
  footer, article, nav, header {
    flex-grow: 1;
  }
  footer {
    background: cyan;
    block-size: 100px;
  }
  article {
    background: magenta;
    block-size: 25px;
    align-self: flex-start;
  }
  nav {
    background: yellow;
    block-size: 50px;
    align-self: center;
  }
  header {
    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;

    /* Enlarge 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>