<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>PWA test name</title>
</head>
<body>
<main class="offline" id="offline">
    <header>
        <h1>PWA With custom offline page</h1>
    </header>
    <section class="message">
        <h2>You are offline</h2>
    </section>
</main>
</body>
</htm