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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 Overflow Test: Scrollable overflow area of a multicol container in vertical-rl writing-mode</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-overflow-3/#scrollable">
+  <link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+  <meta name="assert" content="This test verifies the nested float element in a multicol container in vertical-rl writing-mode shouldn't contribute to its container'sscrollable overflow area.">
+
+  <style>
+  .scroll-container {
+    writing-mode: vertical-rl;
+    inline-size: 100px;
+    block-size: 100px;
+    overflow: auto;
+  }
+  .multicol {
+    block-size: 100px;
+    inline-size: 100px;
+    column-fill: auto;
+    column-count: 2;
+    column-gap: 0;
+  }
+  .float {
+    float: left;
+    inline-size: 50px;
+    block-size: 100px;
+    background: green;
+  }
+  </style>
+
+  <!--This test passes if the scroll-container has no scrollbar. -->
+
+  <p>Test passes if there is a filled green square.</p>
+  <div class="scroll-container">
+    <div class="multicol">
+      <div>
+        <div style="block-size: 100px; background: green;"></div>
+        <div class="float"></div>
+      </div>
+    </div>
+  </div>
+</html>