You know Flash microsites are on the run when Nike skips the Adobe effects in favor of HTML5. Wieden + Kennedy has a slick new corporate-responsibility site out: Nike’s Better World. It uses HTML5 to provide a seamless navigation of constantly refreshing content as the user scrolls down the page. The overall experience is pretty compelling compared to the befuddling nature of many microsites. One Web design blog quibbles that the videos are still in Flash. Can’t have everything, I guess.