This meta tag was once used by developers of programs for editing web pages - as a tag value, developers of such programs usually indicated the name of their product, or other identifying information. A little later, the CMS developers picked up the baton. With the help of this tag, some developers tried, if not control, then at least roughly count the number of installations of their developments. However, soon after realizing that this facilitates the life of any malicious "non-comrades," the most conscientious developers refused this misguided practice. The fact is that having information about the vulnerabilities and internal structure of the system, it is easy enough to find sites using it and take advantage of vulnerabilities in the list for far from specious purposes. In fact, for CMS - this tag, like a sign: come in who wants to and live at home.
It may make sense for some HTML editing programs that can take into account the features of other editors and use it for reverse engineering the saved page. For example, the Macromedia DreamWeaver editor (now Adobe DreamWeaver) automatically uninstalls and modifies the redundant and specific markup created by these programs when opening HTML files created in Microsoft Word and Microsoft Excel .
Also some tools inserted in the markup necessary for their further work data and for this tag controlled the probability of finding this data in a file. Today, other markers are trying to use for these purposes.
By and large, today is garbage. At present, conscious citizens, as well as non-citizens, but conscious, are used extremely rarely, from the word "absolutely".
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