[StackOverflow] When do textarea change events not get triggered?

Demonstration of when a textarea change events is triggered or not. http://stackoverflow.com/questions/8921868/when-do-textarea-change-events-not-get-triggered

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script src="http://documentcloud.github.com/backbone/backbone-min.js"></script>
<textarea name="test"></textarea><br/>
<a href="#">Just a link</a>

CSS

textarea {
    width: 200px;
    height: 100px;
}

JavaScript

var View = Backbone.View.extend({
    el: 'body',
    events: {
        'keyup textarea': 'doAlert'
    },
    doAlert: function () {
        alert('Textarea changed !');
    }
});

new View();