Search engines rely on the content of a page, among other SEO factors, to determine how well should it rank in search results. Until recently, they only worked on the textual content. But as usability began to grow as a ranking factor, Google started to render webpages much as a modern browser would - with images, CSS, JavaScript, and so on. Google has now updated their guidelines to inform webmasters that blocking search bots from accessing CSS and JavaScript files will now negatively effect the website's search ranking.
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