File: no-white-flash-before-activation.html

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<!DOCTYPE html>
<html class="reftest-wait">
<head>
    <title>View Transitions: No white flash should be visible during the duration of the update callback</title>
    <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#ref-for-captured-in-a-view-transition">
    <link rel="match" href="no-white-flash-before-activation-ref.html">
    <style>
        body {
            margin: 0;
        }
        div {
            width: 100vw;
            height: 100vh;
            background-color: #000;
        }
    </style>
</head>
<body>
    <div></div>
    <script src="/common/reftest-wait.js"></script>
    <script>
        failIfNot(document.startViewTransition, "Missing document.startViewTransition");
        addEventListener("load", () => {
            document.startViewTransition(() => {
                requestAnimationFrame(takeScreenshot);
                return new Promise(() => {});
            });
        });
    </script>
</body>
</html>