PaymentRequest constructor should contain the same method names and data.
  -->
  <meta name="viewport" content="width=device-width">
  <style>
    #success,
    #legacy {
      display: none;
    }
  </style>
</head>
<body>

  <h1>Check Whether User Can Make Payment Before All Prices Are Known</h1>

  <div id="intro">
    <p>
      If the checkout flow needs to know whether <code>PaymentRequest.canMakePayment()</code> 
      will return true even before all line items and their prices are known, then you c