Rendering SEO Manifesto: Why We Need to Go Beyond JavaScript SEO – Search Engine Journal

Rendering SEO Manifesto: Why We Need to Go Beyond JavaScript SEO – Search Engine Journal

Want to make sure that your content gets properly accessed by search engines and ranks high?

In his SEJ eSummit session, Bartosz Góralewicz presented how Google is rendering websites on a large scale and shared insights based on Google’s patents and documentation.

Here’s a recap of his presentation.

JavaScript code

The Problem with JavaScript

Góralewicz and his team found that 40% of content relying on JavaScript is not indexed after 14 days.

It gets worse.

Ten percent of URLs within an average domain are not indexed by Google and we’re talking unique indexable URLs.

This is something to look at, especially since these trends are changing over time and can get worse.

In 2015, Google claimed that they are good with rendering saying:

“[A]s long as you’re not blocking Googlebot from crawling your JavaScript or CSS files, we are generally able to render and understand your web pages like modern browsers.”

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Since 2017, Góralewicz and his team have created a lot of other experiments, including cloaking experiments with JavaScript and others, that revealed crawling and indexing issues encountered by JavaScript-based websites.

That same year, Google started
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