Calling this function we should pass over the function we want to be invoked in the background in those moments when the one and only thread is free (not busy with other tasks).

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script>
        function doInBackground() {
            console.log("doing work in background");
        }
        if (window.requestIdleCallback) {
            console.log("do in background is supported");
            requestIdleCallback(doInBackground);
        }
        else {
            setTimeout(doInBackground, 3);
        }
    </script>
</body>
</html>

The following video clip explains how to use this function, overviews a code sample for using it and explains it.

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