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+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-003-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-rule: 4px solid blue;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  background: rgba(255, 0, 255, 0.3);
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px; column-fill: auto">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>