<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: iframe and main frame transition at the same time</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="iframe-and-main-frame-transition-old-main-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
iframe {
position: fixed;
top: 0;
left: 0;
width: 50vw;
height: 50vh;
}
/* The main frame is showing the old screenshot */
::view-transition-group(root) {
animation-duration: 300s;
}
::view-transition-new(root) {
animation: unset;
opacity: 0;
}
::view-transition-old(root) {
animation: unset;
opacity: 1;
}
</style>
<iframe srcdoc="
<style>
body {
background: orange;
}
</style>
<body></body>"></iframe>
<script>
onload = runTest;
async function startTransition(document, oldColor, newColor) {
document.documentElement.style.background = oldColor;
await document.startViewTransition(() => {
document.documentElement.style.background = newColor;
}).ready;
}
async function runTest() {
await startTransition(document, "green", "lightgreen");
// Start an iframe transition while the main frame transition is showing the
// old screenshot. This change shouldn't show up visually because the old
// screenshot on the main frame still has the iframe's old content.
const iframeDocument = document.querySelector("iframe").contentDocument;
await startTransition(iframeDocument, "blue", "lightblue");
takeScreenshot();
}
</script>
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