$(function() { $('li').append($("<button/>") .text("click me") .click(function() { alert("Good job!"); }) ); });
In jQuery 1.2.6, all three buttons would cause an alert box to be shown. In 1.3.1, only the first does - the click handler does not appear to get copied to the other buttons. This was filed as bug #3966, (and ticket #4161) and was supposedly fixed in 1.3.2.
However, in jQuery 1.3.2, none of the buttons have a click handler!