/Web APIs

HTMLSlotElement: slotchange event

The slotchange event is fired on an HTMLSlotElement instance (<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.


Use the event name in methods like addEventListener(), or set an event handler property.


addEventListener("slotchange", (event) => {});

onslotchange = (event) => {};

Event type

A generic Event.



element.setAttribute("slot", slotName);
// element.assignedSlot = $slot
// element.assignedSlot = null

The following snippet is taken from our slotchange example (see it live also).


let slots = this.shadowRoot.querySelectorAll("slot");
slots[1].addEventListener("slotchange", (e) => {
  let nodes = slots[1].assignedNodes();
    `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.


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
slotchange_event 53 79 63 No 40 10.1 53 53 63 41 10.3 6.0

See also

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