javascript - Uncaught SecurityError: Failed to read the 'contentDocument' property from 'HTMLIFrameElement'

Question

i'm trying to make my own "website checker" for specific needs and i'm having problem accessing the iFrame..

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.

I must do this using iFrame because i need to access classes CSS. Click on this link, load the website and then click "fontSizeErrors" on the right and then you can see the error in the console log.

How can i pass this please?? I couldn't find anything helpful on Google..

Thanks!

Answer 1

That's a normal security measure used by all the browsers. You can't access elements or frames that have a different origin, that would be a huge security flaw. Hence, the browser blocks all the scripts that try to do that kind of stuff. To perform any action inside a frame its content must have the same origin.

For further information take look at this answer of mine.