Using the already-overused to-do app example, let\'s say I want an element with a \"todo\" class (static) and an \"is-done\" class (dynamic):
I don't know if you can do it with bindAttr, but the #view helper does allow you to set both static classes and dynamic ones:
#view
{{#view App.TodoView class="todo" classBinding="isDone"}} inner content {{/view}}