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Attribute directives
Attribute directives are HTML extensions that change the look, feel or behavior of a component/element. As described in the section on Angular directives, these directives do not define their own view.
Other than ngStyle and ngClass directives, there are a few more attribute directives that are part of the core framework. ngValue, ngModel, ngSelectOptions, ngControl, and ngFormControl are some of the attribute directives that Angular provides.
Since 7 Minute Workout uses the ngStyle directive, it would be wise to dwell more on this directive and its close associate ngClass.
While the next section is dedicated to learning how to use the ngClass and ngStyle attribute directives, it is not until Chapter 4, Angular Directives in Depth, that we learn how to create our own attribute directives.