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A website is using this HTML meta tags:
<meta name="revised" content="Monday, November 23, 2015, 2:31 pm" />
But I read on this answer that it is not usable with HTML5 as it's not defined in the specs.
Has it ever been defined in past specs? Or at least been used by some browser vendors?
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Metadata is data (information) about data. <meta> tags always go inside the <head> element, and are typically used to specify character set, page description, keywords, author of the document, and viewport settings. Metadata will not be displayed on the page, but is machine parsable.
On the menu select "window" "HTML source". Near the top of the page you will see the meta tags. Edit the "title" "description" and "keywords".
These tags can be easily abused by web site creators anxious to bait search engines and bring scores of visitors to their sites. The law about metatags is far from settled and many legal scholars are uncomfortable with the conclusion that the unauthorized use of a trademark in a metatag represents infringement.
As explained in the linked answer, it’s not valid to use the revised name in HTML5, because it’s not registered on https://wiki.whatwg.org/wiki/MetaExtensions (as of 2015-09-09).
(In HTML 4.01, it’s valid, because there is no registration required.)
The page http://w3bits.com/meta-tag-revised/ claims that this meta tag is (or at least was in 2013) used by search engines ("Google, Yahoo!, Bing etc."). But it doesn’t give any sources, so that claim doesn’t appear to be trustworthy. Their WordPress plugin Revised Meta Tag doesn’t give any sources either, they only refer to their own page.
Several weeks ago the same question was asked on Webmasters (Do web crawlers use the “revised” meta tag?), but no evidence was found that this meta tag was ever consumed by someone.
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