<html>
  <head>
    <link rel="canonical" href="http://foo.com/article.html"/>
    <meta charset="utf-8"/>
    <meta property="op:generator" content="facebook-instant-articles-sdk-php"/>
    <meta property="op:generator:version" content="1.0.0"/>
    <meta property="op:generator:transformer" content="facebook-instant-articles-sdk-php"/>
    <meta property="op:generator:transformer:version" content="1.0.0"/>
    <meta property="op:markup_version" content="v1.0"/>
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  <body>
    <article>
      <heade