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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>assignedSlot default</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    class CtfSlotHost extends HTMLElement {
      constructor() {
        super();
        this.attachShadow({ mode: "open" }).innerHTML = "<slot></slot>";
      }
    }
    customElements.define("ctf-slot-host", CtfSlotHost);

    var host = document.createElement("ctf-slot-host");
    var text = new Text("Slotted text");
    host.appendChild(text);
    document.body.appendChild(host);

    var slot = text.assignedSlot;
    document.getElementById("out").textContent = [
      slot !== null,
      slot && slot.localName,
      slot === host.shadowRoot.querySelector("slot")
    ].join("\n");
  </script>
</body>
</html>

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Text.assignedSlot — default slot (Try It)