Lificycle methods:
www.polymer-project.org/docs/polymer/polymer.html#lifecyclemethods
Polymer('tag-name', {
created: function() { ... },
ready: function() { ... },
attached: function () { ... },
domReady: function() { ... },
detached: function() { ... },
attributeChanged: function(oldVal, newVal, entireObject) {
console.log(entireObject, 'old: ' + oldVal, 'new:', newVal);
},
});