CSS JS Google caches CSS/JS files for a very long time

eva2000 · Oct 23, 2018

According to Seroundtable.com, Google caches CSS and Javascript files for a very long time so if you use CSS/JS to render a page for new content or what new URLs are created, it may affect your SEO if Google has problems rendering your pages.

Google's John Mueller confirmed on Twitter that Google does cache your JavaScript and CSS files for a "fairly long" time and thus, if those files change what content shows up on the page or what new URLs you produce, then that might be an issue for your SEO strategy.

John said "Yes - we cache these files [JavaScript and CSS] fairly long, so if you rely on them changing (content or URL) frequently, that might make rendering impossible or at least hard."

So if you use these files to show Google specific fresh content or new URLs, try to think about how you can give them this new content and URLs other ways. If Google caches these files for a long time, it may delay how quickly they can pick up new content and URLs on your site.

Forum discussion at Twitter.
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Seems very problematic as alot of sites rely on CSS/JS to structure and build out a HTML web page. CSS can be used to hide certain HTML for certain viewports for different devices/screen sizes etc.

deltahf · Oct 28, 2018

Very interesting. I always update a timestamp on my CSS and JS and this would help prevent these issues.

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