Working with custom elements
Instead of making a new Polymer component from scratch or starting with an existing HTML element and building upon that as we did in the previous recipe, you can also simply use custom-made Polymer elements.
This recipe will implement some of the core and paper elements of the Polymer project (http://www.polymer-project.org/docs/elements/). The paper_elements project is the Polymer implementation of Google's Material Design UI widgets (for more information, refer to http://www.polymer-project.org/docs/elements/material.html). There will be more and more of these, either written in JavaScript with a custom Dart wrapper to use them, or purely in Dart, and you can also combine them with your own Polymer components. You ...
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