Some websites don't allow that resources from a different domain than that of itself are being loaded. If you want your website to have Mopinion feedback forms it can be necessary to add HTTP headers. For more information on Content Security Policy headers please see https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP.
Content Security Policy header
Below you will find the domain Mopinion uses and an example of how this should be defined in Nginx.
|font-src||'self' data: https://*.mopinion.com https://fonts.gstatic.com|
Example in Nginx:
add_header Content-Security-Policy "script-src 'self' 'unsafe-eval' 'unsafe-inline' https://*.mopinion.com; style-src 'self' https://*.mopinion.com https://fonts.googleapis.com; frame-src https://*.mopinion.com; connect-src https://*.mopinion.com; font-src 'self' data: https://*.mopinion.com https://fonts.gstatic.com;";
<IfModule mod_headers.c> <FilesMatch "\.(ttf|ttc|otf|eot|woff| woff2|font.css|css|js)$"> Header set Access-Control-Allow-Origin "*.mopinion.com" </FilesMatch>
For more information on Cross-Origin Resource Sharing please see this article about CORS at MDN web docs.