Evidence of the Surprising State of JavaScript Indexing

Ecompromo | May 28, 2017 | SEO Resources

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Posted by willcritchlow

Back when I started in this industry, it was standard advice to tell our clients that the search engines couldn’t execute JavaScript (JS), and anything that relied on JS would be effectively invisible and never appear in the index. Over the years, that has changed gradually, from early work-arounds (such as the horrible escaped fragment approach my colleague Rob wrote about back in 2010) to the actual execution of JS in the indexing pipeline that we see today, at least at Google.

In this article, I want to explore some things we’ve seen about JS indexing behavior in the wild and in controlled tests and share some tentative conclusions I’ve drawn about how it must be working.

A brief introduction to JS indexing

At its most basic, the idea behind JavaScript-enabled indexing is to get closer to the search engine seeing the page as the user sees it. Most users browse with JavaScript enabled, and many sites either fail without it or are severely limited. While traditional indexing considers just the raw HTML source received from the server, users typically see a page rendered based on the DOM (Document Object Model) which can be modified by …read more



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