contenteditable example
HTML
<p class="source" contenteditable="true">edit me</p>
<div id="target">edit them</div>
JavaScript
(function(){
var $target=$('#target'),
$source=$('.source'),
prev_value;
$source.on('focus', function () {
prev_value = $(this).html();
});
$source.on('blur', function () {
alert($(this).html() === prev_value);
});
})()