title: Finding Open Graph tags on youtube
body: <p>I'm working on a Tampermonkey script to hide related videos on youtube if the <code>og:video:tag</code> contains "League of Legends".</p>
  
  <p>When I use the Open Graph Debugger (<a href="https://developers.facebook.com/tools/debug/sharing/?q=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DsbmIEmc5l58%26t%3D10m23s" rel="nofollow noreferrer">link</a>) it find many tags (<code>og:video:url</code>, <code>og:video:width</code>, <code>og:video:tag</code>, ...) but when I search in the DOM I am unable to find any of these elements.</p>
  
  <p>I've tried disabling all my extensions, from a clean profile, from incognito as well as using an Open Graph Extension still I can't find the tags.</p>
  
  <p>Some other attempts:</p>
  
  <pre><code>$('[property="og:type"]') =&gt; null.
  
  document.getElementsByTagName('meta') =&gt; two unrelated tags.
  </code></pre>