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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-view-transitions/update-callback-called-once.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html class="reftest-wait">
<title>Update callback should only be called once</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#call-dom-update-callback-algorithm">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-500">
<style>
#target {
width: 100px;
height: 100px;
background-color: red;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="target"></div>
<script>
addEventListener("load", () => {
let updateCallbackCalled = false;
document.startViewTransition(function() {
target.style.backgroundColor = updateCallbackCalled ? "red" : "green";
updateCallbackCalled = true;
document.startViewTransition(() => {});
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.documentElement.classList.remove("reftest-wait");
});
});
});
});
</script>
</html>