imperative-slot-layout-invalidation-001.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/imperative-slot-layout-invalidation-001.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>Imperative slotting API: Invalidation on re-assignment</title>

<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1752694">

<link rel=match href="imperative-slot-layout-invalidation-001-ref.html">

<link rel=author href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">

<link rel=author href="https://mozilla.org" title="Mozilla">

<div id="host">

  <span>one</span>

</div>

<script>

  let host = document.getElementById("host");

  function assignFirstChild() {

    host.shadowRoot.querySelector("slot").assign(host.firstElementChild);

  host.attachShadow({ mode: "open", slotAssignment: "manual" }).innerHTML = "<slot>Fallback</slot>";

  assignFirstChild();

  host.getBoundingClientRect();

  host.insertAdjacentHTML("afterbegin", "<span>two</span>");

  assignFirstChild();

</script>