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It seems google crawlers run js. But documentations of ajax-crawling techniques are still available on Google Developers site.

Are they still valid and necessary to be followed?

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Both pages show that these pages are deprecated as of October 2015. Perhaps you're looking at a cached version of the page?

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Google have in fact deprecated the AJAX crawling scheme.

They have a post on the Webmaster Central Blog explaining this. Basically, if your site already uses it you'll continue being indexed as you already are. But as you upgrade your site you should move away from using the _escaped_fragment_ technique.

Google now recommend using progressive enhancement techniques instead.

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