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chromium/content/test/data/page_with_rss_in_body.html 

<html>
<head>
  <!--Some non-RSS link tags-->
  <link />
  <link type="other" href="other" />
  <link type="application/rss+xml" />
  <link type="application/rss+xml" rel="alternate" href="https://badurl:💩/" />
  <link type="application/rss+xml" href="no-rel.xml" />
  <link type="application/rss+xml" rel="bad-rel" href="bad-rel.xml" />
  <link type="application/rss+xml" rel="non-ascii-💩"
        href="non-ascii-rel.xml" />
  <link type="application/rss+xml+💩" rel="service.feed"
        href="non-ascii-type.xml" />
</head>
<body>
  <p>This page has valid rss links in its body.</p>
  <link type="application/rss+xml" rel="alternate" href="rss-in-body.xml" />
  <link type="application/RSS+atom" rel="service.feed"
        href="atom-in-body.xml" />
  <link type="application/atom+XML" rel="AlTeRnAtE"
        href="https://some/path-in-body.xml" />
  <!--Some non-RSS link tags-->
  <link />
  <link type="other" href="other-in-body" />
  <link type="application/rss+xml" />
  <link type="application/rss+xml" rel="alternate"
        href="https://badurl:💩/in-body" />
  <link type="application/rss+xml" href="no-rel-in-body.xml" />
  <link type="application/rss+xml" rel="bad-rel" href="bad-rel-in-body.xml" />
  <link type="application/rss+xml" rel="non-ascii-💩"
        href="non-ascii-rel-in-body.xml" />
  <link type="application/rss+xml+💩" rel="service.feed"
        href="non-ascii-type-in-body.xml" />
</body>
</html>