title: What is blob in the <video src=blob:url>?
body: <p>Can anyone explain what the <code>blob:</code> indicates in the URL in this video tag?</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;video class="" 
         style="width: 640px; height: 360px; left: 0px; top: 0px; transform: none; opacity: 1;" 
         src="blob:https://www.youtube.com/5c42620b-a028-451b-9b64-424996802355"&gt;
  &lt;/video&gt;
  </code></pre>