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---
title: "HTMLSlotElement: slotchange event"
short-title: slotchange
slug: Web/API/HTMLSlotElement/slotchange_event
page-type: web-api-event
browser-compat: api.HTMLSlotElement.slotchange_event
---
{{APIRef}}
The **`slotchange`** event is fired on an {{DOMxRef("HTMLSlotElement")}} instance ({{HTMLElement("slot")}} element) when the node(s) contained in that slot change.
> [!NOTE]
> The `slotchange` event doesn't fire if the children of a slotted node change — only if you change (e.g. add or delete) the actual nodes themselves.
In order to trigger a **slotchange** event, one has to set or remove the `slot` attribute.
This event is not cancelable.
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("slotchange", (event) => {});
onslotchange = (event) => {};
```
## Event type
A generic {{domxref("Event")}}.
## Examples
```js
element.setAttribute("slot", slotName);
// element.assignedSlot = $slot
element.removeAttribute("slot");
// element.assignedSlot = null
```
The following snippet is taken from our [slotchange example](https://github.com/mdn/web-components-examples/tree/main/slotchange) ([see it live also](https://mdn.github.io/web-components-examples/slotchange/)).
```js
let slots = this.shadowRoot.querySelectorAll("slot");
slots[1].addEventListener("slotchange", (e) => {
let nodes = slots[1].assignedNodes();
console.log(
`Element in Slot "${slots[1].name}" changed to "${nodes[0].outerHTML}".`,
);
});
```
Here we grab references to all the `<slot>`s, then add a `slotchange` event listener to the template's second slot — which is the one which has 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
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
{{domxref("HTMLSlotElement")}}