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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1209217">
<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/declarative-shadow-dom-polyfill.js"></script>
<script src="resources/shadow-dom.js"></script>
<script src="resources/focus-utils.js"></script>
<div id=div1 tabindex=0>one</div>
<span>
<template shadowrootmode=open>
<slot name=myslot></slot>
</template>
<slot slot=myslot>
<div id=div2 tabindex=0>two</div>
<div id=div3 tabindex=0>three</div>
<div id=div4 tabindex=0>four</div>
</slot>
</span>
<div id=div5 tabindex=0>five</div>
<script>
promise_test(async () => {
polyfill_declarative_shadow_dom(document);
div1.focus();
assert_equals(document.activeElement, div1);
await navigateFocusForward();
assert_equals(document.activeElement, div2);
await navigateFocusForward();
assert_equals(document.activeElement, div3);
await navigateFocusForward();
assert_equals(document.activeElement, div4);
await navigateFocusForward();
assert_equals(document.activeElement, div5);
await navigateFocusBackward();
assert_equals(document.activeElement, div4);
await navigateFocusBackward();
assert_equals(document.activeElement, div3);
await navigateFocusBackward();
assert_equals(document.activeElement, div2);
await navigateFocusBackward();
assert_equals(document.activeElement, div1);
}, `Verifies that focus order goes in flat tree order with buttons inside nested slots which have a mixture of assigned and unassigned states.`);
</script>
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