The update specifies that, for optimal rendering and indexing, you should allow Googlebot access to the JavaScript, CSS, and image files used by your page.

Don’t be alarmed if you received a warning from Google in your email today — many webmasters were alerted that “Googlebot cannot access your JavaScript and/or CSS files.” Google sent out ...

Google is now sending out a rush of new warnings via Google Search Console, formerly Google Webmaster Tools to notify webmasters that GoogleBot cannot access their CSS and JS (JavaScript) files on ...