Get the Whitepaper called HTML5 Modern Day Attack and Defence Vectors. This paper analyzes most of the features introduced in HTML5 along with the vulnerabilities each feature introduces.
You can download it from the following link: https://packetstormsecurity.com/files/download/127318/HTML5AttackVectors_RafayBaloch_UPDATED.pdf
Source: https://packetstormsecurity.com/files/127318/HTML5-Modern-Day-Attack-And-Defence-Vectors.html