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Why All SEOs Should Unblock JavaScript & CSS... And Why Google Cares
If you want to rank as well as you possibly can, unblocking JavaScript and CSS is one of the easiest SEO changes you can make—especially for those with a significant amount of mobile traffic. Jennifer Slegg shares the warning letter many SEOs and webmasters received from Google about this, and goes over the hows and whys of unblocking JS and CSS files on your site.