This issue was originally filed by @Emasoft

PROBLEM:
Many web developers are really considering Dart for building web applications but they are confused about Polymer. They fear that Polymer elements created with Dart cannot be used in non Dart applications. They would like to be sure that Polymer elements created with Dart would be compatible with non Dart applications before adopting Dart.

SOLUTION:

• Polymer elements created with Dart must work out of the box when used in non Dart applications.
• A javascript compact polymer element generated from a Polymer.Dart element should be self-sufficient and self-contained. It should be possible for the developer to easily just drop it into a new page and start using it on its own, whitout any additional coding or external libraries.
• Polymer.Dart should provide fallbacks and polyfills to make the elements behaviour identical both in javascript and in Dart even without including the dart.js library.
• dart2js should be able to export a compact javascript version of the elements made with Polymer.Dart, forcing a very aggressive "tree shaking" optimization on the resulting code to minimize code size.
• dart2js should be able to optionally generate self-contained javascript code for those polymer elements. The exported javascript code should be able to work with other polymers elements and polymer.dart elements without conflicts even when the same Dart framework code is duplicated in many elements. It should be possible for many of these distinct polymer elements to work and function in the same application without interfearing with each other or depending on other modules being present or loaded.
• An explicit "export as a javascript Polymer element" option should be added to the Dart Editor when Polymer.Dart is used in a Dart project
• The developer should always be able to export his Polymer.Dart element both in the Dart standard version (with standard javascript fallback requiring dart.js) and in the compact self-contained javascript version with no requirement for dart.js or other additional libraries.