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<!DOCTYPE html>
<title>
View transitions: Resizing viewport before animating rejects the ready promise.
</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="author" href="mailto:bokan@chromium.org">
<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>
<script>
function pollForResize(win) {
const initial_width = win.innerWidth;
return new Promise(resolve => {
const interval_id = win.setInterval(() => {
if (win.innerWidth != initial_width) {
win.clearInterval(interval_id);
resolve();
}
}, 100);
});
}
promise_test(async t => {
assert_implements(
document.startViewTransition, 'Missing document.startViewTransition');
let popup_win;
// Open a popup window that we'll use to start a transition
await test_driver.bless('Open a popup in a new window', () => {
popup_win = window.open('about:blank', 'popup', 'width=300,height=300');
});
// Resize the window while the update callback is running (i.e. before
// capturing the new state).
let transition = popup_win.document.startViewTransition(async () => {
// resizeTo is asynchonous so we want to wait until it takes effect
// before proceeding to capture the new state. Needs to poll for a
// changed size since rAFs are currently blocked (and thus, so is
// `resize` event).
const popup_resize = pollForResize(popup_win);
popup_win.resizeTo(popup_win.innerWidth/2, popup_win.innerHeight/2);
await popup_resize;
});
// Since the window was resized before capturing the new state, the
// transition must be skipped and the ready promise rejected.
let did_finish = false;
transition.finished.then(() => { did_finish = true; });
await promise_rejects_dom(t, 'InvalidStateError', popup_win.DOMException,
transition.ready, 'Resize must must reject `ready`.');
assert_true(did_finish, 'Transition must be skipped.');
});
</script>
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