Error: Permission denied to access property "x"
There was attempt to access an object for which you have no permission. This is likely an <iframe> element loaded from a different domain for which you violated the same-origin policy.
<!DOCTYPE html>
<html>
<head>
<iframe id="myframe" src="http://www1.w3c-test.org/common/blank.html"></iframe>
<script>
onload = function() {
console.log(frames[0].document);
// Error: Permission denied to access property "document"
}
</script>
</head>
<body></body>
</html>
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Property_access_denied