The graphic novel—book-length comics—began to gain attention after Will Eisner popularized the term with his book A Contract with God (1978). The term became widely known with the public after the commercial success of Maus, Watchmen, and The Dark Knight Returns in the mid-1980s. In the 21st century graphic novels became established in mainstream bookstores and libraries and webcomics became common.

Answer this question, if possible (if impossible, reply "unanswerable"): The loss in popularity of the Watchmen, The Dark Knight Returns and what other comic helped popularize "graphic novel" as a term?
unanswerable