[audreyt]

Comparing the ES5-DOM-only version: https://github.com/audreyt/500lines/tree/master/spreadsheet/... with with the AngularJS-with-ES5 version: https://github.com/audreyt/500lines/tree/master/spreadsheet/... would illustrate the issue of separation of concerns.

The DOM-only version had to construct its own view in JS, and use an additional #_A1 encoding to fill in calculated values into display, while the AngularJS version is declarative in that regard.