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This example defines a simple directive, which is a UI component. The defined component (called “zippy”) has header and content. Click on its header toggles the visibility of the content.
From the first example we can note that the whole DOM tree is a composition of elements. The root component is the html element, directly followed by the nested elements head and bodyand so on…
In the second, JavaScript, example we see that the template property of the directive, contains markup with ng-transclude directive inside it. So this means that inside the directive zippy we have another directive called ng-transclude, i.e. composition of directives. Theoretically we can nest the components infinitely until we reach a leaf node.
