Another example where the VM and dart2js differ is, as others linked to elsewhere in this discussion, that dart2js relies on undefined/unspecced behavior in bro

Another example where the VM and dart2js differ is, as others linked to elsewhere in this discussion, that dart2js relies on undefined/unspecced behavior in browsers, https://code.google.com/p/dart/issues/detail?id=13285 https://code.google.com/p/dart/issues/detail?id=13285 In other words a dart2js app can break after a browser update, fail to run on a new browser that is fully standards compliant, etc.