title: How img tag gets content over cors headers
body: <p>Why, when I use fetch, to load the data from the server with disabled response CORS headers, I'v expectedly got an error:<br>
  <code>Failed to load http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:63343' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.</code><br>
  But image from img tag is presented
  <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script&gt;
      fetch('http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg').then(console.log);
  &lt;/script&gt;
  &lt;img src="http://www.imgworlds.com/wp-content/uploads/2015/12/18-CONTACTUS-HEADER.jpg"&gt;</code></pre>
  </div>
  </div>
  </p>