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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 the sequence of elements assigned to this slot, or alternatively the slot's fallback content.

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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support53 No1

592

Yes — 593

No4010.1
name53 No1

592

Yes — 593

No4010.1
assignedNodes53 No1

592

Yes — 593

No4010.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5353 No1

592

Yes — 593

4010.16.0
name5353 No1

592

Yes — 593

4010.16.0
assignedNodes5353 No1

592

Yes — 593

4010.16.0

1. Under consideration

2. From version 59: this feature is behind the dom.webcomponents.shadowdom.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

3. 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.

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