::slotted()

The ::slotted() CSS pseudo-element represents any element that has been placed into a slot inside an HTML template (see Using templates and slots for more information).

This only works when used inside CSS placed within a shadow DOM. Note also that this selector won't select a text node placed into a slot; it only targets actual elements.

/* Selects any element placed inside a slot */
::slotted(*) {
  font-weight: bold;
}

/* Selects any <span> placed inside a slot */
::slotted(span) {
  font-weight: bold;
}

Syntax

::slotted( <compound-selector> )

Examples

Highlighting slotted elements

The following snippets are taken from our slotted-pseudo-element demo (see it live also).

In this demo we use a simple template with three slots:

<template id="person-template">
  <div>
    <h2>Personal ID Card</h2>
    <slot name="person-name">NAME MISSING</slot>
    <ul>
      <li><slot name="person-age">AGE MISSING</slot></li>
      <li><slot name="person-occupation">OCCUPATION MISSING</slot></li>
    </ul>
  </div>
</template>

A custom element — <person-details> — is defined like so:

customElements.define('person-details',
  class extends HTMLElement {
    constructor() {
      super();
      let template = document.getElementById('person-template');
      let templateContent = template.content;

      const shadowRoot = this.attachShadow({mode: 'open'});

      let style = document.createElement('style');
      style.textContent = 'div { padding: 10px; border: 1px solid gray; width: 200px; margin: 10px; }' +
                           'h2 { margin: 0 0 10px; }' +
                           'ul { margin: 0; }' +
                           'p { margin: 10px 0; }' +
                           '::slotted(*) { color: gray; font-family: sans-serif; } ';

      shadowRoot.appendChild(style);
      shadowRoot.appendChild(templateContent.cloneNode(true));
  }
})

You'll see that when filling the style element with content, we select all slotted elements (::slotted(*)) and give them a different font and color. This allows them to stand out better next to the slots that haven't been successfully filled.

The element looks like this when inserted into the page:

<person-details>
  <p slot="person-name">Dr. Shazaam</p>
  <span slot="person-age">Immortal</span>
  <span slot="person-occupation">Superhero</span>
</person-details>

Specifications

Specification
Unknown specification
# slotted-pseudo

Browser compatibility

BCD tables only load in the browser

See also