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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/whatwg/html/issues/8904">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
<button id=b1>button 1</button>
<button id=b2>button 2</button>
<div id=host>
<template shadowrootmode=open>
<button>button in shadowroot outside dialog</button>
</template>
</div>
<dialog id=mydialog>
<button id=b3>button in dialog</button>
<div id=dialoghost>
<template shadowrootmode=open>
<button>button in shadowroot in dialog</button>
</template>
</div>
</dialog>
<div id=host2>
<template shadowrootmode=open>
<dialog>
<slot></slot>
</dialog>
</template>
<button id=host2button>button</button>
</div>
<script>
polyfill_declarative_shadow_dom(document);
test(() => {
b1.focus();
mydialog.show();
b2.focus();
mydialog.close();
assert_equals(document.activeElement, b2);
}, 'Focus should not be restored if the currently focused element is not inside the dialog.');
test(() => {
const shadowbutton = host.shadowRoot.querySelector('button');
b2.focus();
mydialog.show();
shadowbutton.focus();
mydialog.close();
assert_equals(document.activeElement, host, 'document.activeElement should point at the shadow host.');
assert_equals(host.shadowRoot.activeElement, shadowbutton, 'The button in the shadowroot should remain focused.');
}, 'Focus restore should not occur when the focused element is in a shadowroot outside of the dialog.');
test(() => {
const shadowbutton = dialoghost.shadowRoot.querySelector('button');
b2.focus();
mydialog.show();
shadowbutton.focus();
mydialog.close();
assert_equals(document.activeElement, b2);
}, 'Focus restore should occur when the focused element is in a shadowroot inside the dialog.');
test(() => {
const dialog = host2.shadowRoot.querySelector('dialog');
b2.focus();
dialog.show();
host2button.focus();
dialog.close();
assert_equals(document.activeElement, b2);
}, 'Focus restore should occur when the focused element is slotted into a dialog.');
</script>
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