What is the difference between ng-click and data-ng-click in angularjs?

Question

From 1st view seems like data-ng-click can pass some data as argument to method should be invoked during pressing on button.

But I don\'t see the differ

Answer 1

HTML5 has an ability to embed custom data attributes on all HTML elements

These new custom data attributes consist of two parts:

Attribute Name The data attribute name must be at least one character long and must be prefixed with 'data-'. It should not contain any uppercase letters.

Attribute Value The attribute value can be any string.

Celery

source : http://html5doctor.com/html5-custom-data-attributes/