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<!doctype html>
<title>Visual Viewport Resize Event Order</title>
<meta charset=utf-8>
<link rel="help" href="https://wicg.github.io/visual-viewport/index.html">
<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>
<style>
iframe {
width: 300px;
height: 300px;
}
</style>
<body>
<iframe srcdoc="<!DOCTYPE html>"></iframe>
</body>
<script>
async function oneRaf(win) {
return new Promise((resolve) => {
win.requestAnimationFrame(resolve);
});
}
// Runs the test on the given window object, asserts that event handlers on the
// DOMWindow object are fired before those on the VisualViewport object.
// `resizeFunc` is used to perform the resize.
async function runTest(win, resizeFunc) {
const resize_events = [];
win.onresize = () => { resize_events.push('window-attribute'); }
win.addEventListener('resize', () => { resize_events.push('window-addEventListener'); });
win.visualViewport.onresize = () => { resize_events.push('visualViewport-attribute'); }
win.visualViewport.addEventListener('resize', () => {
resize_events.push('visualViewport-addEventListener'); });
assert_equals(resize_events.toString(), '', 'PRECONDITION');
resizeFunc(500, 600);
await oneRaf(win);
assert_equals(resize_events.toString(),
'window-attribute,window-addEventListener,' +
'visualViewport-attribute,visualViewport-addEventListener');
}
onload = () => {
// Test the event order in a top-level window which we will programmatically
// resize.
promise_test(async t => {
let popup = null;
test_driver.bless('Open a popup in a new window', () => {
popup = window.open('about:blank', 'newwindow', 'width=300,height=300');
});
await t.step_wait(() => popup != null, "Opened popup window");
await runTest(popup, (x, y) => {popup.resizeTo(x, y);});
}, 'Popup: DOMWindow resize fired before VisualViewport.');
// Also test the resize resulting from an iframe's size change.
promise_test(async t => {
const iframe = frames[0];
await runTest(iframe, (x, y) => {iframe.frameElement.style.width = x + 'px';
iframe.frameElement.style.height = y + 'px';
iframe.frameElement.offsetWidth; /* force reflow */});
}, 'iframe: DOMWindow resize fired before VisualViewport.');
}
</script>
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