I'd recommend using Errai (http://erraiframework.org/) ... you get to program in a well-known, type-safe language and much of the JavaEE infrastructure is extended into the browser. Errai is based on GWT but allows the use of HTML as the templating language (instead of UiBinder which is GWT's XML-based templating function).

One great thing about both Errai and GWT projects is that they're optimized for many browsers and the compiler abstracts away the differences between browsers (by compiling a version of the application for each).