File: document-onfullscreenerror.html

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<!DOCTYPE html>
<title>Document#onfullscreenerror</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
    promise_test(async (t) => {
        assert_equals(
            document.onfullscreenerror,
            null,
            "initial onfullscreenerror"
        );
        const [, event] = await Promise.all([
            promise_rejects_js(
                t,
                TypeError,
                document.documentElement.requestFullscreen()
            ),
            new Promise((r) => document.addEventListener("fullscreenerror", r)),
        ]);
        assert_equals(event.target, document.documentElement);
        assert_true(event instanceof Event);
    }, "Checks that the fullscreenerror event is fired when entering fullscreen fails");
</script>