css - Angular 2: How to style host element of the component?

Question

I have component in Angular 2 called my-comp:

<my-comp></my-comp>

How does one style the host element of this component in Angular 2?

In Polymer, You would use ":host" selector. I tried it in Angular 2. But it doesn't work.

:host {
  display: block;
  width: 100%;
  height: 100%;
}

I also tried using the component as selector:

my-comp {
  display: block;
  width: 100%;
  height: 100%;
}

Both approaches don't seem to work.

Thanks.

Answer 1

There was a bug, but it was fixed in the meantime. :host { } works fine now.

Also supported are

• :host(selector) { ... } for selector to match attributes, classes, ... on the host element

• :host-context(selector) { ... } for selector to match elements, classes, ...on parent components

• selector /deep/ selector (alias selector >>> selector doesn't work with SASS) for styles to match across element boundaries

  • UPDATE: SASS is deprecating /deep/.
    Angular (TS and Dart) added ::ng-deep as a replacement that's also compatible with SASS.

  • UPDATE2: ::slotted ::slotted is now supported by all new browsers and can be used with `ViewEncapsulation.ShadowDom
    https://developer.mozilla.org/en-US/docs/Web/CSS/::slotted

See also Load external css style into Angular 2 Component

/deep/ and >>> are not affected by the same selector combinators that in Chrome which are deprecated.
Angular emulates (rewrites) them, and therefore doesn't depend on browsers supporting them.

This is also why /deep/ and >>> don't work with ViewEncapsulation.Native which enables native shadow DOM and depends on browser support.