This error occurs when an obsolete tag is found
As with the Nuindex tag, the lack of access to pages using the robots.txt file is not considered an SEO error, but it is better to be very careful in using such solutions. 2. Errors in using Accelerated Mobile Pages (AMP) The AMP project was implemented by Google in 2015. Using AMP increases the loading speed of the site. In the following, we discuss the common problems caused by using AMP. Obsolete components – 0.18 percenton AMP pages. In order to avoid such problems, it is better to check the components of fast mobile pages from time to time. CSS errors Some styles may not conform to AMP rules.In such cases, Google will probably index the normal version of the pages. Errors Phone Number List in JavaScript codes - 0.08% This is similar to CSS errors. Non-application of AMP – 0.02 percent In these cases, AMP is enabled, but the item is not indexed by Google at all. 3. SEO errors related to meta tags Too long title/description meta tag – 15.48%/7.71% One of the general and practical guidelines for the optimal use of the description meta tag is to use no more than 11 words (roughly equivalent to 65 characters) or less in the page title. As you know, values higher than this will also be indexed in Google. (But they don't appear in search results) In the case of meta descriptions, this optimal value is between 100 and 320 characters.
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Recently, Google increased the number of characters that can be displayed in the search results. So now the probability of the description metatag being too long has been reduced. Additional title/description metatags – 8.56% – 7.04% The title and description of each page should be independent and different from other pages. Otherwise, it will be difficult for Google to determine which page to display for a keyword in the search results. So if the pages with the same titles also have similar content, Google will index only one of them. This SEO error will definitely have a negative impact on the site's SEO .
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