Slotable.assignedSlot

The assignedSlot read-only property of the Slotable interface returns an HTMLSlotElement representing the <slot> element the node is inserted in.

Syntax

var slotElement = elementInstance.assignedSlot

Value

An HTMLSlotElement instance, or null if the element is not assigned to a slot, or if the associated shadow root was attached with its mode set to closed (see Element.attachShadow for further details).

Examples

In our simple-template example (see it live), we create a trivial custom element example called <my-paragraph> in which a shadow root is attached and then populated using the contents of a template that contains a slot named my-text.

When <my-paragraph> is used in the document, the slot is populated by a slotable element by including it inside the element with a slot attribute with the value my-text. Here is one such example:

<my-paragraph>
  <span slot="my-text">Let's have some different text!</span>
</my-paragraph>

In our JavaScript file we get a reference to the <span> shown above, then log a reference to the original <slot> element the <span> was inserted in.

let slottedSpan = document.querySelector('my-paragraph span')
console.log(slottedSpan.assignedSlot); // logs '<slot name="my-text">'

Specifications

Specification Status Comment
Unknown
The definition of 'assignedSlot' in that specification.
Unknown Initial definition.

Browser Compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
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 — 65
Disabled
Disabled From version 59 until version 65 (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 — 65
Disabled
Disabled From version 59 until version 65 (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 40Safari iOS Full support 10.1Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
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

Contributors to this page: ExE-Boss, chrisdavidmills
Last updated by: ExE-Boss,