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Test Info:

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Interaction of 'inert' attribute with fullscreen element</title>
<link rel="author" title="Peng Zhou" href="mailto:zhoupeng.1996@bytedance.com">
<meta name="assert" content="Checks that fullscreen element inertness from ancestors.">
<div id="wrapper">
wrapper
<span>
wrapper-child element
</span>
<div id="fullscreen">
fullscreen
<span id="child">
child
</span>
</div>
</div>
<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>
async function cleanup() {
if (document.fullscreenElement) {
await document.exitFullscreen();
}
getSelection().removeAllRanges();
}
async function setupTest(element, context) {
element.inert = true;
await test_driver.bless("request full screen");
await fullscreen.requestFullscreen();
context.add_cleanup(async () => {
element.inert = false;
await cleanup();
});
}
add_completion_callback(cleanup);
promise_test(async function() {
await setupTest(child, this);
assert_false(window.find("wrapper"));
assert_false(window.find("wrapper-child"));
assert_true(window.find("fullscreen"));
assert_false(window.find("child"));
}, "Inner nodes with 'inert' attribute become inert anyways");
promise_test(async function() {
await setupTest(fullscreen, this);
assert_false(window.find("wrapper"));
assert_false(window.find("wrapper-child"));
assert_false(window.find("fullscreen"));
assert_false(window.find("child"));
}, "If the fullscreen element has the 'inert' attribute, everything becomes inert");
promise_test(async function() {
await setupTest(wrapper, this);
assert_false(window.find("wrapper"));
assert_false(window.find("wrapper-child"));
assert_true(window.find("fullscreen"));
assert_true(window.find("child"));
}, "If an ancestor of the fullscreen element has the 'inert' attribute, the fullscreen element escapes inertness");
</script>