[mythz]

Do you have any example other than integer overflow?

It's the only difference I've ever heard referenced.

The Dart team spends enormous efforts on maintaining JS-compatibility, so much so that it rejects adding any language features that can't efficiently compile to JS.

[azakai]

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

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.