Mootools 1.3 (compat), HTML, CSS, JavaScript
jQuery 1.5, HTML, CSS, JavaScript
In this example, a mouseover event is raised when the mouse is moved over both the span and div elements. You can see that the one that doesn't stop bubbling will raise it for the div also, even if the mouse is over the span element.
jQuery 1.4.4, HTML, CSS, JavaScript
jQuery 1.6.4, HTML, CSS, JavaScript