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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLSlotElement/assign below:

HTMLSlotElement: assign() method - Web APIs

assign(node1)
assign(node1, node2)
assign(node1, node2, /* â¦, */ nodeN)

Parameters

node1, â¦, nodeN: A set of Element or Text nodes.

Return value

None (undefined).

Exceptions

NotAllowedError DOMException: Thrown when calling this method on an automatically assigned slot.

Examples

In the example below, the assign() method is used to display the correct tab in a tabbed application. The function is called and passed the panel to show, which is then assigned to the slot.

function UpdateDisplayTab(elem, tabIdx) {
  const shadow = elem.shadowRoot;
  const slot = shadow.querySelector("slot");
  const panels = elem.querySelectorAll("tab-panel");
  if (panels.length && tabIdx && tabIdx <= panels.length) {
    slot.assign(panels[tabIdx - 1]);
  } else {
    slot.assign();
  }
}

Specifications Browser compatibility

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