The term "first class citizen" usually means there is a language syntax built-in for the feature that would be "first class." Dart has no such built-in syntax t

The term "first class citizen" usually means there is a language syntax built-in for the feature that would be "first class." Dart has no such built-in syntax to deal with DOM elements. You have to use the API to manipulate the DOM. For example, the C language does not have OOP as a first class citizen. However, you can do OOP in C. GTK+ and GObject, for example, accomplish it.