How can I style child components in Angular 4 using ::ng-deep?

Styling Child Components in Angular 4 with ::ng-deep

Overwriting CSS properties from parent to child components can be a common task in Angular. In Angular 4, you can leverage the ::ng-deep selector to accomplish this.

::ng-deep, formerly known as /deep/ and later >>>, is a shadow-piercing combinator that allows styles to cascade down to nested elements, even if they are encapsulated within child components. This is particularly useful when customizing the appearance of elements within external components or libraries.

Usage

To use ::ng-deep, simply prefix it to the CSS selector you want to apply to the child component's elements. For example:

.parent {
  ::ng-deep .child-element {
    color: red;
  }
}

Compatibility

It's important to note that ::ng-deep is not supported in Internet Explorer 11 (IE11). This is because IE11 does not support shadow-piercing combinators. For this reason, it's recommended to use alternative methods for styling child components in IE11, such as using the View Encapsulation flag or creating an Angular module that exposes the desired styles.

Example

Consider the following HTML:

<code class="html"><div class="container">
  <app-child-component></app-child-component>
</div></code>

And the following CSS:

<code class="css">.container {
  ::ng-deep {
    .child-element {
      color: blue;
    }
  }
}</code>

This CSS will apply the blue color to all elements with the class child-element within the app-child-component.

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