I\'m just starting to learn Polymer. Here is a generic version of my polymer element:
For every attribute there is a watcher. So in your case it should be looking like this. Although there are 2 different implementation, one with attribute name as the first argument of the function.
Polymer('in-element', {
title: 'me',
titleChanged: function(oldVal, newVal) {
// do something
}
});
Polymer change watchers