::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-list> )

where
<compound-selector-list> = <compound-selector>#

where
<compound-selector> = [ <type-selector>? <subclass-selector>* [ <pseudo-element-selector> <pseudo-class-selector>* ]* ]!

where
<type-selector> = <wq-name> | <ns-prefix>? '*'
<subclass-selector> = <id-selector> | <class-selector> | <attribute-selector> | <pseudo-class-selector>
<pseudo-element-selector> = ':' <pseudo-class-selector>
<pseudo-class-selector> = ':' <ident-token> | ':' <function-token> <any-value> ')'

where
<wq-name> = <ns-prefix>? <ident-token>
<ns-prefix> = [ <ident-token> | '*' ]? |
<id-selector> = <hash-token>
<class-selector> = '.' <ident-token>
<attribute-selector> = '[' <wq-name> ']' | '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'

where
<attr-matcher> = [ '~' | | | '^' | '$' | '*' ]? '='
<attr-modifier> = i | s

Examples

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 Status Comment
CSS Scoping Module Level 1
The definition of '::slotted' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
::slottedChrome Full support 50Edge No support NoFirefox Full support 63
Full support 63
No support 59 — 63
Disabled
Disabled From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 37Safari Full support 10WebView Android Full support 50Chrome Android Full support 50Firefox Android Full support 63
Full support 63
No support 59 — 63
Disabled
Disabled From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 37Safari iOS Full support 10Samsung Internet Android Full support 5.0

Legend

Full support  
Full support
No support  
No support
User must explicitly enable this feature.
User must explicitly enable this feature.

See also