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Test Info:

<!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>
<input id=i0 value=i0>
<div id=outer>
<template data-mode=open>
<div id=inner>
<template data-mode=open>
<div>
<slot name=inside></slot>
</div>
</template>
<slot name=inside slot=inside>
<input id=i1 value=i1>
</slot>
</div>
</template>
</div>
<input id=i2 value=i2>
<script>
promise_test(async () => {
convertTemplatesToShadowRootsWithin(document.getElementById('outer'));
const elements = [
'i2',
'outer/i1',
'i0'
];
await assert_focus_navigation_backward(elements);
}, `Verifies that focusing backwards from a button inside a slot which has no assigned nodes goes to the previous focusable element.`);
</script>