title: Uncaught SecurityError: Failed to read the 'contentDocument' property from 'HTMLIFrameElement'
body: <p>i'm trying to make my own "website checker" for specific needs and i'm having problem accessing the iFrame..</p>
  
  <blockquote>
    <p>Uncaught SecurityError: Failed to read the 'contentDocument' property
    from 'HTMLIFrameElement': Blocked a frame with origin "http://
    checker.xcore.co.il" from accessing a frame with origin "http://
    xcore.co.il". The frame requesting access set "document.domain" to
    "checker.xcore.co.il", but the frame being accessed did not. Both must
    set "document.domain" to the same value to allow access.</p>
  </blockquote>
  
  <p>I must do this using iFrame because i need to access classes CSS.
  <a href="http://checker.xcore.co.il/" rel="nofollow">Click on this link</a>, load the website and then click "fontSizeErrors" on the right
  and then you can see the error in the console log.</p>
  
  <p>How can i pass this please?? I couldn't find anything helpful on Google..</p>
  
  <p>Thanks!</p>