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diff --git a/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested-delegatesFocus.html b/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested-delegatesFocus.html
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+++ b/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested-delegatesFocus.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="resources/shadow-dom.js"></script>
+<script src="resources/focus-utils.js"></script>
+<div id="log"></div>
+<!--
+This test case is based on the crbug.com/618587 reproduction case:
+http://jsbin.com/bonudiwagu/1/edit?html,output
+-->
+<input id='i0'>
+<div id='x-foo'>
+  <template data-mode='open' data-delegatesFocus>
+    <input id='inner-before'>
+    <slot></slot>
+    <input id='inner-after'>
+  </template>
+  <div id='nested'>
+    <template data-mode='open' data-delegatesFocus>
+      <input id='nested-x'>
+      <slot></slot>
+      <input id='nested-y'>
+    </template>
+    <input id='light'>
+  </div>
+</div>
+<input id='i1'>
+
+<script>
+promise_test(async () => {
+  var xFoo = document.querySelector('#x-foo');
+  convertTemplatesToShadowRootsWithin(xFoo);
+
+  var elements = [
+    'i0',
+    'x-foo/inner-before',
+    'nested/nested-x',
+    'light',
+    'nested/nested-y',
+    'x-foo/inner-after',
+    'i1'
+  ];
+
+  await assert_focus_navigation_forward(elements);
+  elements.reverse();
+  await assert_focus_navigation_backward(elements);
+}, 'Focus controller should treat each slot as a focus scope.');
+</script>