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Algorithm mobile-first index became known in 2016, thanks to the high-profile announcement from Google. Despite extensive discussions, people still do not understand, how does mobile version for indexing.
Before the user has searched for information on the Internet from a mobile device, and show the results from the mobile index. Conversely, if the desktop of the device was seen with desktop results.
Now, regardless of the device you use, Google shows results from the mobile index. Accordingly, the search results will be given to sites optimized for mobile devices.
the Essence of the algorithm to a mobile-first index is that more and more people use Google search via smartphones, so mobile-you need to filter out sites that are not relevant to the content of your desktop version. Often developers cut version for mobile on the full version, hiding behind the sliders pieces of content, or worse, with scripts that are not handled by search engines. But mobile first index does not take into account hidden content, to which you want to "get to".
the Situation today
Webmasters started to using the search console, as follows:
the Essence of the letter — your site gets most visits from mobile devices, so you're ready for mobile-first indexing. This means that in the first place, Google will crawl the website with a mobile UserAgent (User Agent).
the official documentation from Google, it becomes clear that there is no "separate issue for PC":
"Previously, the relevancy of the content were estimated primarily based on the version for computers. However, now the majority of users search on Google using mobile devices, so when indexing larger value will have a mobile version of the pages. We are not going to create a separate index and will continue to use common".
that is, if the page was indexed in mobile UserAgent, based on the analysis, the mobile version will be displayed and its full version.
How will this affect the current position?
Not all worry about the positions of their sites. First, Google does not apply the mobile-first indexing sites that are not ready for it.
secondly, not all sites will be affected by mobile-first index. Here is the official table:
that is, the owners of web sites with adaptive layout to survive still do not have. Importantly, mobile menu contains all the same links, that and desktop, so as not to hide the content and not to cut it.
Much more difficult doing things with the mobile version on a separate URL. In this case, the website must fully comply with content (text and visual) of its full version to have the same metadata, including the alt images. In an era of abundance adaptive frameworks (e.g. Bootstrap), there is no need to create a subdomain for the mobile version. But if a remake adaptiv problematic, it is necessary to reckon with a new algorithm for indexing.
When you create AMP pages* we should try to preserve the same functionality and the same benefit to users that provides full version. Then Google will be more supportive and lift up your AMP the village is higher than the competitors ' sites with responsive layout, that always run slower.
*the AMP page — Accelerated Mobile Pages, a technology developed by Google for the download lightweight versions of pages at a low speed network connection. Analogue AMP — Turbo-page of Yandex.
the Impact on the overall situation in the market of SEO
on the one hand, Google refuses to index the full version of the site. On the other hand, combining "mobile" and "desktop" SERP one suggests that to compete under equal without adaptive layout or AMP just will not work. This means that in the near future will increase the number of customers who dream about "adaptive website cheap."
the Author PR.Sape, Vadim Gavrilenko
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