<!DOCTYPE html>
<html>
<body>
<link rel="help" href="https://drafts.csswg.org/mediaqueries-4/#mf-dimensions">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

async function createFrameAndUpdateLayout(test) {
    const iframe = await new Promise((resolve) => {
        const iframe = document.createElement('iframe');
        iframe.style.width = '100px';
        iframe.style.height = '100px';
        iframe.onload = () => resolve(iframe);
        document.body.appendChild(iframe);
        test.add_cleanup(() => iframe.remove());
    });
    iframe.contentDocument.body.innerHTML = '<span>some content</span>';
    window.preventOptimization1 = iframe.getBoundingClientRect();
    window.preventOptimization2 = iframe.contentDocument.querySelector('span').getBoundingClientRect();
    return iframe;
}

for (const query of ['(max-width: 150px)', '(width: 100px)', '(orientation: portrait)', '(aspect-ratio: 1/1)', '(max-aspect-ratio: 4/3)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        assert_true(mediaQuery.matches);
        iframe.style.width = '200px';
        assert_false(mediaQuery.matches);
    }, `matchMedia('${query}').matches should update immediately`);
}

for (const query of ['(height: 100px)', '(max-height: 150px)', '(min-aspect-ratio: 3/4)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        assert_true(mediaQuery.matches);
        iframe.style.height = '200px';
        assert_false(mediaQuery.matches);
    }, `matchMedia('${query}').matches should update immediately`);
}

for (const query of ['(min-height: 150px)', '(aspect-ratio: 1/2)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        assert_false(mediaQuery.matches);
        iframe.style.height = '200px';
        assert_true(mediaQuery.matches);
    }, `matchMedia('${query}').matches should update immediately`);
}

for (const query of ['(min-width: 150px)', '(min-aspect-ratio: 4/3)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        assert_false(mediaQuery.matches);
        iframe.style.width = '200px';
        assert_true(mediaQuery.matches);
    }, `matchMedia('${query}').matches should update immediately`);
}

for (const query of ['(max-width: 150px)', '(width: 100px)', '(orientation: portrait)', '(aspect-ratio: 1/1)', '(max-aspect-ratio: 4/3)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        let changes = 0;
        mediaQuery.addEventListener('change', () => ++changes);
        assert_true(mediaQuery.matches);
        assert_equals(changes, 0);
        iframe.style.width = '200px';
        assert_false(mediaQuery.matches);
        assert_equals(changes, 0);
        await new Promise(requestAnimationFrame);
        assert_false(mediaQuery.matches);
        assert_equals(changes, 1);
    }, `matchMedia('${query}') should not receive a change event until update the rendering step of HTML5 event loop`);
}

for (const query of ['(max-width: 150px)', '(width: 100px)', '(orientation: portrait)', '(aspect-ratio: 1/1)', '(max-aspect-ratio: 4/3)']) {
    promise_test(async function () {
        const iframe = await createFrameAndUpdateLayout(this);
        const mediaQuery = iframe.contentWindow.matchMedia(query);
        const events = [];
        iframe.contentWindow.addEventListener('resize', () => {
            assert_array_equals(events, []);
            events.push('resize');
        });
        mediaQuery.addEventListener('change', () => events.push('change'));
        assert_true(mediaQuery.matches);
        assert_array_equals(events, []);
        iframe.style.width = '200px';
        assert_false(mediaQuery.matches);
        assert_array_equals(events, []);
        await new Promise(requestAnimationFrame);
        assert_false(mediaQuery.matches);
        assert_array_equals(events, ['resize', 'change']);
    }, `matchMedia('${query}') should receive a change event after resize event on the window but before a requestAnimationFrame callback is called`);
}

</script>
</body>
</html>
