Why is meta keywords deprecated? I use them for my custom website search. I don't care that external search engines don't index it.
(As for external search engines,FWIR, in its heyday some search engines briefly regarded it quite respectfully, but eventually due to SEO spam they either started to ignore it, or took it as a negative signal, allegedly. But as pointed out in sibling comment, it still survives in Yandex, what is quite surprising plot twist for me.)
https://html.spec.whatwg.org/multipage/semantics.html#meta-k...
So, it's standardized and not deprecated.
It has this note though:
"Many search engines do not consider such keywords, because this feature has historically been used unreliably and even misleadingly as a way to spam search engine results in a way that is not helpful for users."
HTML 4.01 says the following:
"This specification does not define a set of legal meta data properties. The meaning of a property and the set of legal values for that property should be defined in a reference lexicon called a profile. For example, a profile designed to help search engines index documents might define properties such as "author", "copyright", "keywords", etc."
Note to self: Apparently, I mentally froze around 2009, so I have some decades to catch on. It seems the breaking point was after 2009 Hixie's WONFIX for adding keywords [0], at a time when both `keywords` and `description` were both swept aside into "MetaExtensions" [1]. The turning point I clearly missed came in 2010 [2] and got resolved through [3].
[0] https://lists.w3.org/Archives/Public/public-html-bugzilla/20... [1] https://web.archive.org/web/20090205191845/http://wiki.whatw... [2] https://lists.w3.org/Archives/Public/public-html/2010Feb/016... [3] https://www.w3.org/Bugs/Public/show_bug.cgi?id=7525