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+<!DOCTYPE html>
+<html>
+<head>
+<title>View transitions: Resizing viewport skips the transition</title>
+<link rel="help" href="https://github.com/WICG/view-transitions">
+<link rel="author" href="mailto:bokan@chromium.org">
+
+<script src="/common/rendering-utils.js"></script>
+<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 waitForAtLeastOneFrame(win) {
+ return new Promise(resolve => {
+ win.requestAnimationFrame(() => {
+ win.requestAnimationFrame(() => {
+ resolve();
+ });
+ });
+ });
+}
+
+let popupWin;
+promise_test(async t => {
+ assert_implements(document.startViewTransition, "Missing document.startViewTransition");
+
+ return new Promise(async (resolve, reject) => {
+ await waitForAtLeastOneFrame(window);
+
+ // Open a popup window that we'll use to start a transition
+ await test_driver.bless('Open a popup in a new window', () => {
+ popupWin = window.open('about:blank', 'popup', 'width=300,height=300');
+ });
+ let popupDoc = popupWin.document;
+ popupDoc.documentElement.innerHTML = `
+ <style>
+ html {background-color: red;}
+ html.new {background-color: limegreen;}
+
+ /* Set a no-op animation to show the old snapshot indefinitely. */
+ html::view-transition-group(*) {animation-duration: 10s;}
+ html::view-transition-new(*) {animation: unset;opacity: 0;}
+ html::view-transition-old(*) {animation-duration: 10s;opacity: 1;}
+ </style>`;
+
+ // Start a transition inside the popup.
+ let transition = popupDoc.startViewTransition(() => {
+ popupDoc.documentElement.classList.add('new');
+ });
+
+ let finishResolved = false;
+ transition.finished.then(() => {
+ finishResolved = true;
+ });
+
+ // Wait for the transition to start animating.
+ await transition.ready;
+ await waitForAtLeastOneFrame(popupWin);
+ await waitForAtLeastOneFrame(popupWin);
+
+ // Resize the popup window.
+ popupWin.resizeTo(popupWin.innerWidth/2, popupWin.innerHeight/2);
+
+ await waitForAtLeastOneFrame(popupWin);
+
+ // `finish` should have resolved as resizing the transition after capture
+ // should cause it to skip.
+ assert_true(finishResolved, "Transition must be finished by the window resize");
+ resolve();
+ });
+});
+</script>
+</head>
+</html>