Which are the standard W3C meta tags?

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HTML5

You can only use the following values in HTML5. If you need a value not listed, you’d have to register it first.

name values

http-equiv values

HTML 4.01

In HTML 4.01 there is no registry defined, so you can use whatever values you like. See http://www.w3.org/TR/html401/struct/global.html#h-7.4.4:

This specification does not define a set of legal meta data properties.

The spec gives some examples for name values, like:

  • author
  • keywords
  • description
  • copyright
  • date
  • ROBOTS

And for http-equiv values, like:

  • Expires
  • PICS-Label
  • Content-Type

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