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


var slotElement = elementInstance.assignedSlot


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).


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:

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

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">'


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

Browser Compatibility

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Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 53.0 (Yes) No support (Yes) No support
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 53.0 (Yes) No support (Yes) No support 53.0


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 Contributors to this page: chrisdavidmills
 Last updated by: chrisdavidmills,