<slot>: The Web Component Slot element

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


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
slot 53 79 63 No 40 10 53 53 63 41 10 6.0
name 53 79 63 No 40 10 53 53 63 41 10 6.0

See also

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