Setting Properties with a Directive

The @HostBinding decorator allows us to programatically set a property value on the directive's host element. It works similarly to a property binding defined in a template, except it specifically targets the host element. The binding is checked for every change detection cycle, so it can change dynamically if desired.

Notice that for both use cases of we are passing in a string value for which property we want to affect. If we don't supply a string to the decorator, then the name of the class member will be used instead.

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