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> making established things harder (<a href="..." target="_blank")

What are you referring to? That example would have worked identically.

It's invalid in XHTML2, as well as XHTML 1 Strict.

You mean the target attribute? It wasn't in XHTML 1 Strict or 1.1, but you're wrong about XHTML 2. http://www.w3.org/TR/xhtml2/mod-hyperAttributes.html#adef_hy...