On 11th Jan I appeared for Microsoft Exam 70-480 (Programming in HTML5 with JavaScript and CSS3 Specialist certification) and yes I cleared it. Now I'm Microsoft Certified Professional, feels great. Last time I gave certification Exam and I failed i scored 680 something and the passing was 700, I was very disappointed at that moment but Dhananjay Kumar sir (DJ - awesome person) motivated me and now when I have got this, I would like to dedicate it you DJ sir.
Microsoft offers Microsoft Specialist certifications for exam 70-480 and 70-483, so now I'm certified specialist in Programming with HTML5.
My Experience : This exam was not so tough, It had HTML5 questions and the maximum part was covered by JQuery and Javascript. HTML5 part was easy, and yeah you need to be strong in JS and JQuery part. Here are some reference I'm posting for preparation.
1 - W3schools for HTML5
2 - Channel9 for Javascript
Hope you do well, cheers. :)