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<!doctype html>
<title>Exiting fullscreen from a nested shadow root should work correctly.</title>
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1652155">
<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>
<div id="host">
<button>
<!--
This is gross, but testdriver doesn't let us click stuff in shadow
DOM, so here we are instead, using nested slots.
-->
fullscreen
</button>
</div>
<script>
promise_test(async function() {
let host = document.getElementById("host");
host.attachShadow({ mode: "open" }).innerHTML = `
<style>
#outer { width: 200px; height: 200px; background: blue }
</style>
<div id="outer">
<slot></slot>
</div>
`;
let outer = host.shadowRoot.getElementById("outer");
outer.attachShadow({ mode: "open" }).innerHTML = `
<style>
#inner { width: 100px; height: 100px; background: purple }
</style>
<div id="inner"></div>
<slot></slot>
`;
let button = document.querySelector("button");
let inner = outer.shadowRoot.getElementById("inner");
let finished = new Promise(resolve => {
button.addEventListener("click", async function() {
await outer.requestFullscreen();
assert_equals(outer.getRootNode().fullscreenElement, outer);
assert_equals(document.fullscreenElement, host);
button.addEventListener("click", async function() {
await inner.requestFullscreen();
assert_equals(inner.getRootNode().fullscreenElement, inner);
assert_equals(document.fullscreenElement, host);
await document.exitFullscreen();
assert_equals(inner.getRootNode().fullscreenElement, null);
assert_equals(outer.getRootNode().fullscreenElement, outer);
assert_equals(document.fullscreenElement, host);
resolve();
}, { once: true });
requestAnimationFrame(() => requestAnimationFrame(() => {
test_driver.click(button);
}));
}, { once: true });
});
test_driver.click(button);
await finished;
}, "Exiting fullscreen from a nested shadow root works correctly.");
</script>
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