У вашего броузера проблема в совместимости с HTML5
Learn how to knit in the round on two circular needles with Planet Purl's video. Taught by Beth Moriarty, author of Deep South Knitting (http://deepsouthknitting.com), "American Sock Knitting" (http://americansockknitting.com) and designer at http://PurlQueenPatterns.com.