Html elements keygen, time, and command

keygen element The HTML keygen element exists to facilitate generation of key material, and submission of the public key as part of an HTML form, time element The HTML time element (<time>) represents either time on a 24-hour clock or a precise date in the Gregorian calendar (with optional time and timezone information), command element The command element represents a command which the user can invoke. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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