What is the `::content` pseudo-element and how does it work with `::slotted`?

What is the ::content/::slotted pseudo-element and how does it work?

The ::content pseudo-element is used to select distributed nodes inside of an element. It is typically paired with the ::slotted pseudo-element, which selects nodes that have been slotted into an element.

How does it work?

When a component is registered, it creates a shadow DOM which is a self-contained and isolated environment. The shadow DOM contains the component's style and markup, and it is not affected by the styles of the main document.

When a component is instantiated, it is inserted into the main document, and its shadow DOM is also created. The shadow DOM is connected to the main document by a slot element, which allows the component's content to be rendered into the main document.

Nodes are distributed from the component's markup to the slot element using the ::distributed pseudo-element. The ::content pseudo-element can then be used to select and style these nodes, even if they are not directly descendants of the component element.

Example

The following example shows how to use the ::content pseudo-element to style the content of a component:

#my-component ::content {
  color: red;
}

This code will change the color of all text within the component to red.

Note:

The ::slotted pseudo-element is used in newer versions of CSS and it is not supported by all browsers. For compatibility with older browsers, you should use the ::content pseudo-element instead.

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