Web/API/HTMLSlotElement

The HTMLSlotElement interface of the Shadow DOM API enables access to the name and assigned nodes of an HTML <slot> element.

Properties

HTMLSlotElement.name

DOMString: Can be used to get and set the slot's name.

Methods

HTMLSlotElement.assignedNodes()

Returns a sequence of the nodes assigned to this slot, and if the flatten option is set to true, the assigned nodes of any other slots that are descendants of this slot. If no assigned nodes are found, it returns the slot's fallback content.

HTMLSlotElement.assignedElements()

Returns a sequence of the elements assigned to this slot (and no other nodes). If the flatten option is set to true, it also returns the assigned elements of any other slots that are descendants of this slot. If no assigned nodes are found, it returns the slot's fallback content.

Events

slotchange

Fired on an HTMLSlotElement instance (<slot> element) when the node(s) contained in that slot change.

Examples

The following snippet is taken from our slotchange example ([[../../../../../../mdn.github.io/web-components-examples/slotchange/index|see it live also]]).

let slots = this.shadowRoot.querySelectorAll('slot');
slots[1].addEventListener('slotchange', function(e) {
  let nodes = slots[1].assignedNodes();
  console.log('Element in Slot "' + slots[1].name + '" changed to "' + nodes[0].outerHTML + '".');
});

Here we grab references to all the slots, then add a slotchange event listener to the 2nd slot in the template — which is the one that keeps having its contents changed in the example.

Every time the element inserted in the slot changes, we log a report to the console saying which slot has changed, and what the new node inside the slot is.

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'HTMLSlotElement' in that specification.	Living Standard

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
HTMLSlotElement Experimental'	Chrome Full support 53	Edge Full support 79	Firefox Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	IE No support No	Opera Full support 40	Safari Full support 10.1	WebView Android Full support 53	Chrome Android Full support 53	Firefox Android Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0
assignedElements Experimental'	Chrome Full support 65	Edge Full support 79	Firefox Full support 66	IE No support No	Opera Full support Yes	Safari ?	WebView Android Full support 65	Chrome Android Full support 65	Firefox Android Full support 66	Opera Android Full support Yes	Safari iOS ?	Samsung Internet Android Full support 9.0
assignedNodes Experimental'	Chrome Full support 53	Edge Full support 79	Firefox Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	IE No support No	Opera Full support 40	Safari Full support 10.1	WebView Android Full support 53	Chrome Android Full support 53	Firefox Android Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0
name Experimental'	Chrome Full support 53	Edge Full support 79	Firefox Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	IE No support No	Opera Full support 40	Safari Full support 10.1	WebView Android Full support 53	Chrome Android Full support 53	Firefox Android Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0
slotchange event Experimental'	Chrome Full support 53	Edge Full support 79	Firefox Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	IE No support No	Opera Full support 40	Safari Full support 10.1	WebView Android Full support 53	Chrome Android Full support 53	Firefox Android Full support 63 Full support 63 No support 59 — 63 Disabled' Disabled' From version 59 until version 63 (exclusive): this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config. No support ? — 59 Disabled' Disabled' Until version 59 (exclusive): 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.	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

User must explicitly enable this feature.'

User must explicitly enable this feature.

HTMLSlotElement by Mozilla Contributors is licensed under CC-BY-SA 2.5.