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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTML <slot> 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.

Content categories Flow content, phrasing content
Permitted content Transparent
Tag omission None, both the starting and ending tag are mandatory.
Permitted parents Any element that accepts phrasing content
Permitted ARIA roles None
DOM interface HTMLSlotElement


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}
    .name {font-weight: bold; color: #217ac0; font-size: 120%}
    h4 { margin: 10px 0 -8px 0; }
    h4 span { background: #217ac0; padding: 2px 6px 2px 6px }
    h4 span { border: 1px solid #cee9f9; border-radius: 4px }
    h4 span { color: white }
    .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;</code>
        <i class="desc"><slot name="description">NEED DESCRIPTION</slot></i>
    <div class="attributes">
      <slot name="attributes"><p>None</p></slot>

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.


Specification Status Comment
HTML Living Standard
The definition of '<slot>' in that specification.
Living Standard  
The definition of 'Slots' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support53 No Yes1 No4010
name53 No No No4010
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5353 No Yes14010.1 ?
name5353 No No4010.1 ?

1. This feature is behind the dom.webcomponents.enabled preference (needs to be set to true) and the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

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