<!DOCTYPE html>
<!-- This file is meant to test how many times the WebFrameClient will be
  notified of a change in the current manifest URL associated with the document. -->
<html>
  <head>
    <link rel='manifest' href=''>
    <link rel='manifest'>
    <link rel='manifest foo'>
    <link rel='manifest' crossorigin foo bar>
    <!-- 4 times (= 4) -->
  </head>
  <body>
    <link rel='manifest'>
    <!-- 1 time (= 5) -->
  </body>
  <script>
    function createLink(href, rel) {
      var link = document.createElement('link');
      link.href = href;
      link.rel = rel;
      return link;
    }
    var links = document.getElementsByTagName('link');
    var link = document.createElement('link');

    document.head.appendChild(createLink('foo.json', 'manifest'));
    document.head.appendChild(createLink('foo.json', ''));
    document.head.appendChild(createLink('foo.json', 'manifest'));
    document.head.insertBefore(createLink('foo.json', 'manifest'), links[0]);
    // 3 times (= 8)

    links[0].crossOrigin = 'use-credentials';
    links[0].media = '';
    links[0].type = 'image/gif';
    // 2 times (= 10)

    links[0].href = 'bar.json';
    links[0].rel = 'blah';
    links[0].rel = 'manifest';
    // 3 times (= 13)

    document.head.removeChild(links[0]);
    // 1 time (= 14)
  </script>
</html>