This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The slot global attribute assigns a slot in a shadow DOM shadow tree to an element: An element with a slot attribute is assigned to the slot created by the <slot> element whose name attribute's value matches that slot attribute's value. You can have multiple elements assigned to the same slot by using the same slot name. Elements without a slot attribute are assigned to the unnamed slot, if one exists.
For examples, see our Using templates and slots guide.
| Specification |
|---|
| HTML # attr-slot |
| DOM # ref-for-dom-element-slot① |
| Desktop | Mobile | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | |
slot |
53 | ≤79 | 63 | 40 | 10 | 53 | 63 | 41 | 10 | 6.0 | 53 |
<slot> element<template> element::slotted pseudo-element
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https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/slot