I created this trick with simple blank and black HTML page, and browser "Full Screnn" mode.
The HTML file is listed below.
<html>
<head>
<title>Press F11 to end full screen</title>
<style>
html {
background-color: #000000;
}
</style>
</head>
<body>
<h1>Press F11 to end full screen</h1>
</body>
</html>
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