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i wonder if content loaded dynamically by AJAX affect SEO/ability for search engines to index the page?
i am thinking of doing a constantly loading page, something like the Tumblr dashboard where content is automatically loaded as the user scrolls down.
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websites that use AJAX to load content into the page can be much quicker and provide a better user experience. BUT: these websites can be difficult (or impossible) for Google to crawl, and using AJAX can damage the site's SEO.
Even though Google can usually index dynamic AJAX content, it's not always that simple.
Why does Google no longer support the AJAX crawling scheme? Google stopped officially crawling #! URLs in the summer of 2018. They have stopped supporting this scheme as Googlebot can now render AJAX websites using the web rendering service (WRS).
What's AJAX? AJAX stands for Asynchronous JavaScript And XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with servers. It can send and receive information in various formats, including JSON, XML, HTML, and text files.
A year later...
A while back Google came out with specifications for how to create XHR content that may be indexed by search engines. It involves pairing content in your asynchronous requests with synchronous requests that can be followed by the crawler.
http://code.google.com/web/ajaxcrawling/
No idea whether other search giants support this spec, or whether Google even does. If anybody has any knowledge about the practicality of this method this I'd love to hear about their experience..
Edit: As of today, October 14, 2015, Google has deprecated their AJAX crawling scheme:
In 2009, we made a proposal to make AJAX pages crawlable. Back then, our systems were not able to render and understand pages that use JavaScript to present content to users. ... Times have changed. Today, as 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.
H/T: @mark-bembnowski
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Five years later...
Latest update on SEO AJAX:
As of October 14, 2015
Google now is able to crawl and parse AJAX loaded content. SPA or other AJAX rendered page no longer needed to prepare two versions of websites for SEO.
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