To find out how search engines treat JavaScript for indexing, the MOZ team ran an experiment that has brought some useful insights.

Talking about the experiment, Bartosz Góralewicz says, “To see how search engines other than Google deal with JavaScript crawling and indexing, we used our experiment website, http:/jsseo.expert, to check how Googlebot crawls and indexes JavaScript (and JavaScript frameworks’) generated content.

The experiment was quite simple: http://jsseo.expert has subpages with content parsed by different JavaScript frameworks. If you disable JavaScript, the content isn’t visible — i.e. if you go to http://jsseo.expert/angular2/, all the content within the red box is generated by Angular 2. If the content isn’t indexed in Yahoo, for example, we know that Yahoo’s indexer didn’t process the JavaScript”.

Going Beyond Google: Are Search Engines Ready for JavaScript Crawling & Indexation?

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