testing/web-platform/tests/css/css-view-transitions/no-containment-on-old-element.html

   1 <!DOCTYPE html>
   2 <html>
   3 <title>View transitions: transition skipped if no containment on old element</title>
   4 <link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
   5 <link rel="author" href="mailto:khushalsagar@chromium.org">
   6
   7 <script src="/resources/testharness.js"></script>
   8 <script src="/resources/testharnessreport.js"></script>
   9
  10 <style>
  11 div {
  12   width: 100px;
  13   height: 100px;
  14   background: blue;
  15   view-transition-name: target;
  16 }
  17 </style>
  18
  19 <div id=first></div>
  20
  21 <script>
  22 promise_test(async t => {
  23   assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  24   return new Promise(async (resolve, reject) => {
  25     let transition = document.startViewTransition(() => {
  26       first.style.contain = "paint";
  27     });
  28
  29     let readyRejected = false;
  30     transition.ready.then(reject, () => { readyRejected = true; });
  31
  32     let domUpdated = false;
  33     transition.domUpdated.then(() => { domUpdated = true; }, reject);
  34     transition.finished.then(() => {
  35       assert_true(readyRejected, "ready not rejected");
  36       assert_true(domUpdated, "dom not updated");
  37
  38       if (window.getComputedStyle(first).contain == "paint")
  39         resolve();
  40       else
  41         reject("dom update callback did not run");
  42
  43     }, reject);
  44   });
  45 }, "uncontained old element should skip the transition");
  46 </script>