The reason the CSS direct descendant selector does not affect Angular components

We are working with a basic main.html.

<app>
   <sidebar></sidebar>
   <main-content>
      <router-outlet></router-outlet>
   </main-content>
</app>

After loading a component through routing (changing the URL), the HTML structure changes to:

<app>
   <sidebar></sidebar>
   <main-content>
      <router-outlet></router-outlet>
      <component></component>
   </main-content>
</app>

The main question arises as to why <component> is not nested inside <router-outlet>, but rather becomes a sibling.

Furthermore, the following CSS style is not being applied to the <component> tag:

app sidebar main-content > * {
   background: red;
}

Upon inspection, we notice that while <router-outlet> has this style, the direct child of <main-content>, which is <component>, does not inherit this style.

What could be the issue here?

Answer №1

Upon viewing the provided code:

<app>
   <sidebar></sidebar>
   <main-content>
      <router-outlet></router-outlet>
      <component></component>
   </main-content>
</app>

this

app sidebar main-content > * {
   background: red;
}

may not be effective because main-content is not directly nested within sidebar but is instead a sibling.

A better approach would be to try

app sidebar + main-content > * {
   background: red;
}

or alternatively

app main-content > * {
   background: red;
}

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