MQTT-Websocket is a demonstration of connecting to an MQTT server via websockets entirely in javascript and the browser.
There are not a lot of examples out there, and those that exist are riddled with amaturity, as if handing in a school project at the last minute. In an attempt to clean up code and make it easier to both read and modify, a new example has been written.
This is not to say that it does not have issues on its own, my example has no input validation (a production no-no), and could use more documentation.
Within this repository, the example can be found in the gh-pages branch.