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I´m not sure what you are trying to point out.
As for tags not being elements you are certainly right. But this has nothing to do with "not having an absolute close". The term element is defined as
a document structuring unit declared in the DTD
in [w3.org ].
The meta element is declared in [w3.org ]. Therefore the meta element is an element indeed.
Elements consist of a start tag, attributes as defined in the element´s ATTLIST, content and an end tag. An element may be defined as being empty in which case there is no content and in HTML no end tag. In order to conform to the XML spec empty elements must either have an end tag or the start tag must end with /> in XHTML ([w3.org ]).