<!doctype html><!-- webkit-test-runner [ experimental:ResizeObserverEnabled=true ] -->
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>

<div>Test pass if no crash.</div>

<iframe src="./resources/frameset1.html"></iframe>

<script>

function test0() {
    let test = async_test('test0: Frametree changed in callback');
    setInterval(function() {
        let frameset = document.querySelector('iframe').contentDocument.querySelector('frameset');
        if (frameset && frameset.childElementCount == 0) {
            test.done();
        }
    }, 10);
}

test(_ => {
    assert_own_property(window, "ResizeObserver");
}, "ResizeObserver implemented");

test0();
</script>