typeracer.js

var text = $('.nonHideableWords').textContent.split(' '),
	input = $('input');

function triggerKeyboardEvent(el, keyCode)
{
    var eventObj = document.createEventObject ?
        document.createEventObject() : document.createEvent("Events");

    if(eventObj.initEvent){
      eventObj.initEvent("keydown", true, true);
    }

    eventObj.keyCode = keyCode;
    eventObj.which = keyCode;

    el.dispatchEvent ? el.dispatchEvent(eventObj) : el.fireEvent("onkeydown", eventObj); 

} 


for(var i=0; i<text.length; i++){
	var character = text[i];
	input.value = character;
	triggerKeyboardEvent(input, 32)
}