<slot>

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.

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`

Attributes

This element includes the global attributes.

name

The slot's name.

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

Examples

<template id="element-details-template">
  <style>
    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 }
  </style>
  <details>
    <summary>
      <code class="name">&lt;<slot name="element-name">NEED NAME</slot>&gt;</code>
      <i class="desc"><slot name="description">NEED DESCRIPTION</slot></i>
    </summary>
    <div class="attributes">
      <h4>Attributes</h4>
      <slot name="attributes"><p>None</p></slot>
    </div>
  </details>
  <hr>
</template>

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.

Specifications

Specification
HTML Standard (HTML) # the-slot-element
DOM Standard (DOM) # shadow-tree-slots

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

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https://developer.mozilla.org/en-US/docs/Web/HTML/Element/slot