var parent = document.getElementById('parent'),

    child  = document.getElementById('child'),

    op     = document.getElementById('op'),

    op2    = document.getElementById('op2');

​

parent.addEventListener('click', function () {

  op.innerHTML += '<p>click registered</p>';

}, false);

​

function stopEvent (e) {

  e.stopPropagation();

  op2.innerHTML += '<p>propagation stopped</p>';

}

​

child.addEventListener('click', stopEvent, false);