title: Accessing Iframe Cross Origin
body: <p>I have an HTML and an iframe inside it. when I try to access iframe contents it shows error like this.</p>
  
  <pre><code>" Uncaught DOMException: Blocked a frame with origin "http://parattapayyan.surge.sh" from accessing a cross-origin frame.
      at http://parattapayyan.surge.sh/test.html:14:24
  (anonymous) @ test.html:14 "
  </code></pre>
  
  <p>how some chat companies like "intercom" and etc, accessing iframe from external server and components inside iframe..?</p>