The Polymer.dart framework provides a set of Polymer (UI and other) components, but it will only work in the most recent versions of browsers: IE9, IE10, Safari 6, Firefox, and the latest Chrome version (also for Android). It is important to know that, in Polymer, you can only have a single Dart script tag on an HTML document. So, get started with creating a new Polymer application, polymer1, by selecting the Polymer Web application project template (using the polymer library) in Dart Editor.

A new Polymer application

Inspecting pubspec.yaml will reveal the polymer dependency as well as a transformer:

dependencies:
  browser: '>=0.10.0 <0.11.0'
  paper_elements: '>=0.7.0 <0.8.0'
  polymer: '>=0.16.0 <0.17.0'
transformers:
- polymer:
    entry_points: web/index.html

Pub is invoked automatically and it installs polymer and a whole group of packages needed by polymer (such as observe, polymer_expressions, web_components, and so on). We'll now...