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 (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 Standard
The definition of 'HTMLSlotElement' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
HTMLSlotElement
Experimental
Chrome Full support 53Edge No support No
Notes
No support No
Notes
Notes Under consideration
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 NoOpera Full support 40Safari Full support 10.1WebView Android Full support 53Chrome Android Full support 53Edge Mobile No support No
Notes
No support No
Notes
Notes Under consideration
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 41Safari iOS Full support 10.1Samsung Internet Android Full support 6.0
name
Experimental
Chrome Full support 53Edge No support No
Notes
No support No
Notes
Notes Under consideration
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 NoOpera Full support 40Safari Full support 10.1WebView Android Full support 53Chrome Android Full support 53Edge Mobile No support No
Notes
No support No
Notes
Notes Under consideration
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 41Safari iOS Full support 10.1Samsung Internet Android Full support 6.0
assignedElements
Experimental
Chrome Full support 65Edge No support NoFirefox Full support 66IE No support NoOpera Full support YesSafari ? WebView Android Full support 65Chrome Android Full support 65Edge Mobile No support NoFirefox Android Full support 66Opera Android Full support YesSafari iOS ? Samsung Internet Android Full support Yes
assignedNodes
Experimental
Chrome Full support 53Edge No support No
Notes
No support No
Notes
Notes Under consideration
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 NoOpera Full support 40Safari Full support 10.1WebView Android Full support 53Chrome Android Full support 53Edge Mobile No support No
Notes
No support No
Notes
Notes Under consideration
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 41Safari iOS Full support 10.1Samsung Internet Android Full support 6.0
slotchange event
Experimental
Chrome Full support 53Edge No support NoFirefox 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 NoOpera Full support 40Safari Full support 10.1WebView Android Full support 53Chrome Android Full support 53Edge Mobile No support NoFirefox 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 41Safari iOS Full support 10.1Samsung 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.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

Document Tags and Contributors

Last updated by: irenesmith,