https://docs.angularjs.org/guide/expression
The simplest example using data bindings =
<span>
1+2={{1+2}}
</span>
works with
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.0-rc.2/angular.min.js"></script>
and the output is 1 + 2 = 3
but if I change to the current workable angular script
<script data-require="angular.js@*" data-semver="2.0.0-alpha.25" src="https://code.angularjs.org/2.0.0-alpha.25/angular.js"></script>
the output is 1+2={{1+2}}
So why does the current angular not allow this simple data binding example to work?