Same jQuery code produces different results in different browsers. The code bellow attaches a new checkbox, which is checked in Firefox and Chrome, while in IE (tested in IE6 and IE8) it produces checkbox which is not checked.

//using any of the bellow constructors, results are the same
var newField = $("<input></input>").attr("type", "checkbox");	
//var newField = jQuery(document.createElement("input")).attr("type", "checkbox");	
newField.attr("checked", "checked");
$("#someElement").after(newField);