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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 Reference: Fragmentation of a fixed block-size single-line column flex container and a fixed block-size flex item that has overflows</title>
+  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+
+  <style>
+  .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. */
+  }
+  .flexContainer {
+    display: block;
+    background: gray;
+    /* border-width is 0 by default; some sub-testcases will increase it. */
+    border: 0 solid lightgray;
+    /* Block-size is deliberately made shorter than its flex items. */
+    block-size: 40px;
+  }
+  .border-padding {
+    border-block-width: 10px;
+    padding-block: 5px;
+  }
+
+  article {
+    inline-size: 30px;
+    /* Block-size is deliberately made shorter than its <div> child. */
+    block-size: 70px;
+    background: cyan;
+  }
+  article > div {
+    inline-size: 20px;
+    block-size: 140px;
+    background: magenta;
+  }
+  </style>
+
+  <body>
+    <!-- Basic one without any margin/border/padding. -->
+    <div class="multicol">
+      <div class="flexContainer">
+        <article><div></div></article>
+      </div>
+    </div>
+
+    <!-- Test a container with margin-block-start. -->
+    <div class="multicol">
+      <div class="flexContainer" style="margin-block-start: 25px">
+        <article><div></div></article>
+      </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">
+        <article><div></div></article>
+      </div>
+    </div>
+
+    <!-- Test a container with border and padding. -->
+    <div class="multicol">
+      <div class="flexContainer border-padding">
+        <article><div></div></article>
+      </div>
+    </div>
+  </body>
+</html>