Como leo en algunas páginas, parece que Google está probando una nueva interfaz de resultados de búsqueda!. Dicen que aparece al azar pero no me la he cruzado 
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How to read this blog
This blog should be read like all other specifications. First, it should be read cover-to-cover, multiple times. Then, it should be read backwards at least once. Then it should be read by picking random sections from the contents list and following all the cross-references.Promote JS
