During yesterday, Google suddenly simultaneously send mass emails to to inform Google Bot website blocking access CSS and JavaScript files. Why did Google notice it. Google Bot visit the website under its own algorithm, but we can control it to retrieve data via the robots.txt file located in the root directory of the website. Therefore, this announcement means that a file or CSS / JS on websites are blocked by robots.txt, Google Bot will not be accessible. This phenomenon may be because you block certain directory. So to make sure that we allow access Google Bot CSS and JavaScript files, just add the following declaration on the website robots.txt (not there is created).
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