Using chmod, chown chgrp
Change File / Directories permissions.
chmod 0777 . -R #
chmod g+s /var/www #
chmod +x *.sh #
Change File / Folder Owner.
chown www-data:www-data -R .
Change File / Directories Group.
Example :
For example in the top window (Parent): (the_iframe.contentWindow.postMessage('data', 'domain');
)