File: paint-holding-in-iframe.html

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<!DOCTYPE html>
<html class="reftest-wait">
<title>View transitions: display old paint during update callback</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="match" href="paint-holding-in-iframe-ref.html">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
  .old {
    border: 5px solid black;
  }
  .new {
    border: 5px solid orange;
  }
</style>

<iframe id="inner" class="old" srcdoc="
  <body>
    This is old content
  </body>
"></iframe>
<script>
async function runTest() {
  await waitForAtLeastOneFrame();

  let contentDocument = inner.contentDocument;
  contentDocument.body.style.background = "blue";

  contentDocument.startViewTransition(async () => {
    contentDocument.body.style.background = "green";
    contentDocument.body.innerText = "This is new content";

    inner.classList.toggle('old');
    inner.classList.toggle('new');

    takeScreenshot();
    return new Promise((resolve) => {});
  });
}
onload = runTest;
</script>
</html>