Web Components & Shadow DOM

::slotted(p) {
  color: blue;
  margin: 10px;
}

::slotted(*) {
  border: 1px solid #ccc;
}

To style the slot element itself
To style elements that have been slotted from Light DOM
The ::slotted() pseudo-element is used to: 1) Style elements that have been projected into a slot from the Light DOM, 2) Target specific elements using selectors within the parentheses, 3) Apply styles from within the Shadow DOM to slotted content, 4) Maintain encapsulation while allowing styling of projected content. This is crucial for creating components that can style their projected content while maintaining proper encapsulation.
To create new slots dynamically
To remove slots from the Shadow DOM