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<!DOCTYPE html>
<title>Element#requestFullscreen() on two elements in the same document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../trusted-click.js"></script>
<div id="log"></div>
<div id="a"></div>
<div id="b"></div>
<script>
async_test(t => {
// Request fullscreen on both elements, but in reverse tree order.
const a = document.getElementById('a');
const b = document.getElementById('b');
// Expect two fullscreenchange events, with document.fullscreenElement
// changing in the same order as the requests.
const order = [];
document.onfullscreenchange = t.step_func(() => {
assert_in_array(document.fullscreenElement, [a, b]);
order.push(document.fullscreenElement.id);
if (order.length == 2) {
// Since fullscreenchange event occurs at animation frame timing we might
// have not seen the transition from null -> 'b' but just see the
// resulting 'a' transition twice.
assert_true(order[0] == 'a' || order[0] == 'b', 'first id seen is a or b');
assert_true(order[1] == 'a', 'second id seen is b');
t.done();
}
});
document.onfullscreenerror = t.unreached_func('fullscreenerror event');
trusted_click(t, () => {
b.requestFullscreen();
a.requestFullscreen();
}, document.body);
});
</script>
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