diff --git a/css/css-multicol/nested-at-outer-boundary-as-fieldset.html b/css/css-multicol/nested-at-outer-boundary-as-fieldset.html
new file mode 100644
index 00000000000000..2c64b59a778745
--- /dev/null
+++ b/css/css-multicol/nested-at-outer-boundary-as-fieldset.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-multicol-1/#the-multi-column-model">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="margin-left:-100px; columns:2; height:100px; width:200px; column-gap:0; column-fill:auto; background:red;">
+  <div style="height:100px; background:white;"></div>
+  <fieldset style="columns:2; column-gap:0; border:none; margin:0; padding:0; background:red;">
+    <div style="height:200px; background:green;"></div>
+  </fieldset>
+</div>
diff --git a/css/css-multicol/nested-at-outer-boundary-as-legend.html b/css/css-multicol/nested-at-outer-boundary-as-legend.html
new file mode 100644
index 00000000000000..8bf04490f261ab
--- /dev/null
+++ b/css/css-multicol/nested-at-outer-boundary-as-legend.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-multicol-1/#the-multi-column-model">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="margin-left:-100px; columns:2; height:100px; width:200px; column-gap:0; column-fill:auto; background:red;">
+  <div style="height:100px; background:white;"></div>
+  <fieldset style="border:none; margin:0; padding:0; background:red;">
+    <legend style="columns:2; column-gap:0; margin:0; padding:0; width:100%;">
+      <div style="height:200px; background:green;"></div>
+    </legend>
+  </fieldset>
+</div>
