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<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover keyboard focus behaviors</title>
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<button id=firstfocus tabindex="0">Button 1</button>
<div popover>
<p>This is a popover without a focusable element</p>
</div>
<button id=secondfocus tabindex="0">Button 2</button>
<script>
promise_test(async () => {
const b1 = document.getElementById('firstfocus');
const b2 = document.getElementById('secondfocus');
const popover = document.querySelector('[popover]');
b1.focus();
assert_equals(document.activeElement,b1);
popover.showPopover();
assert_true(popover.matches(':popover-open'));
assert_equals(document.activeElement,b1);
// Tab once
await new test_driver.send_keys(document.body,'\uE004'); // Tab
assert_equals(document.activeElement, b2, 'Keyboard focus should skip the open popover');
assert_true(popover.matches(':popover-open'),'changing focus should not close the popover');
popover.hidePopover();
// Add a focusable button to the popover and make sure we can focus that
const button = document.createElement('button');
button.setAttribute("tabindex", "0");
popover.appendChild(button);
b1.focus();
popover.showPopover();
assert_equals(document.activeElement,b1);
// Tab once
await new test_driver.send_keys(document.body,'\uE004'); // Tab
assert_equals(document.activeElement, button, 'Keyboard focus should go to the contained button');
assert_true(popover.matches(':popover-open'),'changing focus to the popover should leave it showing');
popover.hidePopover();
assert_false(popover.matches(':popover-open'));
}, "Popover should not be keyboard focusable");
</script>
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