test/fixtures/script-load-extensions.html

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<!doctype html>
<html ⚡>
<head>
  <meta charset="utf-8">
  <title>AMP #0</title>
  <link rel="canonical" href="amps.html" >
  <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
  <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
  <script custom-element="amp-iframe" src="https://cdn.ampproject.org/v0/amp-iframe-0.1.js"></script>
  <script src="/dist/amp.js"></script>
</head>
<body>
<amp-fit-text id="fortesting" width="300" height="200" layout="responsive" max-font-size="52">
  Lorem ipsum dolor sit amet, has nisl nihil convenire et, vim at aeque
  inermis reprehendunt.
</amp-fit-text>
<amp-iframe width=300 height=300
    sandbox="allow-scripts allow-same-origin"
    layout="responsive"
    frameborder="0"
    srcdoc="<h1>Testing</h1>">
</amp-iframe>
</body>
<footer>
  <script custom-element="amp-fit-text" src="/dist/v0/amp-fit-text-0.1.max.js"></script>
</footer>
</html>