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

HTMLSlotElement: assign() method - Web APIs

Baseline 2023

Newly available

The assign() method of the HTMLSlotElement interface sets the slot's manually assigned nodes to an ordered set of slottables. The manually assigned nodes set is initially empty until nodes are assigned using assign().

Note: You cannot mix manually (imperative) and named (declarative, automatic) slot assignments. Therefore, for this method to work, the shadow tree needs to have been created with the slotAssignment: "manual" option.

assign(node1)
assign(node1, node2)
assign(node1, node2, /* …, */ nodeN)

None (undefined).

NotAllowedError DOMException

Thrown when calling this method on an automatically assigned slot.

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();
  }
}

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