Html elements abbr, command, and iframe

abbr element Specifies that a string is an abbreviation for a longer word or phrase, command element The command element represents a command which the user can invoke, iframe element Defines an inline frame (ie a frame embedded in a document). These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

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abbr abbr and command, abbr, command, and iframe

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