HTML 5 is apparently the future so as well as developing Q GUI in regular HTML 4 I am also coding in HTML 5 too. Thus allowing for the advantages of HTML 5 to be used in a solution. Assets to HTML 5 like local storage could mean that users preferences could be saved on their machine instead of elsewhere. The ability to drag and drop files into the page, making the interface more dynamic.
HTML 5 is tidier and has better semantics in my opinion which is an asset to a project of this scale where there is a lot of ajax and different parts of the page have their own roles and functions.
Draft HTML 5 views are being developed for the Q GUI