Polymer builds on top of the draft HTML standard of being able to register your own HTML tags that contain HTML, CSS and JavaScript. This opens the way for writ

Polymer builds on top of the draft HTML standard of being able to register your own HTML tags that contain HTML, CSS and JavaScript. This opens the way for writing your website with components like: <google-maps center="London" /> <twitter-tweet id="ABCD" /> <facebook-like id="ABCD" /> <youtube-video id="ABCD" /> Components use internally a shadow DOM for representation so that they are untouched by / do not affect the CSS on the main page.