no-painting-while-render-blocked.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-view-transitions/no-painting-while-render-blocked.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class=reftest-wait>

<title>View transitions: Rendering suppression prevents painting</title>

<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#document-rendering-suppression-for-view-transitions">

<link rel="author" href="mailto:mattwoodrow@apple.com">

<link rel="match" href="no-painting-while-render-blocked-ref.html">

<script src="/common/reftest-wait.js"></script>

<style>

#target {

  width: 200px;

  height: 200px;

  background: green;

</style>

<div id=target></div>

<script>

failIfNot(document.startViewTransition, "Missing document.startViewTransition");

async function runTest() {

  let transition = document.startViewTransition(async () => {

    document.getElementById('target').style.backgroundColor = "red";

    takeScreenshot();

    await new Promise(resolve => setTimeout(resolve, 5000));

});

onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));

</script>