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diff --git a/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested.html b/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested.html
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index 0000000000..7bfe5dc784
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+++ b/testing/web-platform/tests/shadow-dom/focus-navigation/focus-navigation-slot-nested.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'>
+ <input id='inner-before'>
+ <slot></slot>
+ <input id='inner-after'>
+ </template>
+ <div id='nested'>
+ <template data-mode='open'>
+ <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>