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When it comes to optimizing JavaScript for SEO, it's important to consider a few key points that can have a significant impact on your site's search engine visibility.
When processing a page, it is important to correctly handle links to other URLs and files that are necessary to build the document. Each link is queued for scanning and has its own priority. The tag is used to load CSS and JS files , and for internal and external links - the tag with attribute khref.
However, it is worth remembering that links that are loaded via JavaScript will not be detected by search engines until the page rendering process is complete. This slows down site crawling as search engines need to constantly adapt the structure and priority of pages as they render and discover new links loaded via JS.
Google actively caches all files, including , JS and CSS, but your timing settings may not be taken into account and a new copy of the files will be downloaded at the search engine's discretion. This may cause Google to use an outdated version of JavaScript or CSS.
A solution to this problem can be the use of “digital fingerprints” in file names, for example, like this: main.2b85551.zhs. Each time a file is updated, a new version of it is created, and the search engine will use the current copy to render the page.
JavaScript can also cause duplicate content, especially if unique content is loaded dynamically and takes too long to display or load. In such cases, search engines can only index duplicate templates, which is especially true for SPA projects using frameworks like Angular, React or Vue.
The solution to this problem is to use SSR (server-side rendering), that is, rendering content on the server side. In this case, the search bot will receive pre-rendered content, which will eliminate problems with indexing and crawling the page.
Additionally, some sites use JavaScript to handle errors and may send a 200 OK status code instead of the corresponding error code, which may cause erroneous pages to be indexed and displayed in search results.
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If you have any questions about optimizing JavaScript for SEO, you can contact the SEO studio "SEO COMPUTER" with any questions by email info@seo.computer.
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