<script type="text/javascript">
HTMLElement.prototype.pressKey = function(code) {
var evt = document.createEvent("UIEvents");
evt.keyCode = code;
evt.initEvent("keydown", true, true);
this.dispatchEvent(evt);
}
document.body.onkeydown = function(e) {
console.log("key pressed, code=" + e.keyCode);
};
document.body.pressKey(13);
</script>
