lighthouse-cli/test/fixtures/seo/seo-failure-cases.html

<!doctype html>
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 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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<html>
<head>
  <!-- no <title>SEO audit failures page</title> -->
  <meta charset="utf-8">
  <!-- FAIL(font-size): missing viewport -->
  <meta name="viewport" content="invalid-content=should_have_looked_it_up">
  <!-- no <meta name="description" content=""> -->
  <!-- FAIL(is-crawlable): noindex on root page, vary the case to make sure we are case insensitive -->
  <meta name="RoBots" content="nofollow, NOINDEX, all">
  <!-- FAIL(hreflang): invalid language code, vary the case to make sure we are case insensitive -->
  <link rel="alTeRnate" hreflang="xx" href="https://xx.example.com" />
  <!-- FAIL(hreflang): spece before a valid code -->
  <link rel="alternate" href="http://example.com/" hreflang=" x-default" />
  <!-- FAIL(canonical): multiple canonical URLs provided (another one is in the HTTP header) -->
  <link rel="canonical" href="https://example.com/other" />
  <!-- FAIL(json-ld): invalid @type -->
  <script type="application/ld+json">
    {
      "@context": "http://schema.org",
      "@type": "CatConvention",
      "name": "Cat Global"
    }
  </script>
</head>
<body>
  <h1>SEO</h1>

  <h2>Anchor text</h2>
  <a href='https://example.com'>click this</a>
  <a href='/test.html'> click this </a>
  <a href='/test.html'>CLICK THIS</a>
  <svg>
    <a href='https://example.com/svg-link'>
      <circle cx="50" cy="50" r="50"/>
      <text x="0" y="0" >click this</text>
    </a>
  </svg>

  <!-- FAIL(plugins): java applet on page -->
  <applet code=HelloWorld.class width="200" height="200" id='applet'>
    Your browser does not support the <code>applet</code> tag.
  </applet>

  <!-- FAIL(plugins): flash content on page -->
  <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="590" height="90" id="adobe-embed" align="middle">
    <param name="movie" value="movie_name.swf"/>
    <!--[if !IE]>-->
    <object type="application/x-shockwave-flash" data="movie_name.swf" width="590" height="90">
      <param name="movie" value="movie_name.swf"/>
    <!--<![endif]-->
      <a href="http://www.adobe.com/go/getflash">
        <img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player"/>
      </a>
    <!--[if !IE]>-->
    </object>
    <!--<![endif]-->
  </object>
</body>
</html>