<slot>: The Web Component Slot element

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

The <slot> HTML element—part of the Web Components technology suite—is a placeholder inside a web component that you can fill with your own markup, which lets you create separate DOM trees and present them together.


This element includes the global attributes.


The slot's name.

A named slot is a <slot> element with a name attribute.


<template id="element-details-template">
    details {
      font-family: "Open Sans Light", Helvetica, Arial, sans-serif;
    .name {
      font-weight: bold;
      color: #217ac0;
      font-size: 120%;
    h4 {
      margin: 10px 0 -8px 0;
      background: #217ac0;
      color: white;
      padding: 2px 6px;
      border: 1px solid #cee9f9;
      border-radius: 4px;
    .attributes {
      margin-left: 22px;
      font-size: 90%;
    .attributes p {
      margin-left: 16px;
      font-style: italic;
      <code class="name">
        &lt;<slot name="element-name">NEED NAME</slot>&gt;
      <span class="desc"><slot name="description">NEED DESCRIPTION</slot></span>
    <div class="attributes">
      <slot name="attributes"><p>None</p></slot>
  <hr />

Note: You can see this complete example in action at element-details (see it running live). In addition, you can find an explanation at Using templates and slots.

Technical summary

Content categories Flow content, phrasing content
Permitted content Transparent
Events slotchange
Tag omission None, both the starting and ending tag are mandatory.
Permitted parents Any element that accepts phrasing content
Implicit ARIA role No corresponding role
Permitted ARIA roles No role permitted
DOM interface HTMLSlotElement


HTML Standard
# the-slot-element
DOM Standard
# shadow-tree-slots

Browser compatibility

BCD tables only load in the browser

See also