ElementInternals: ariaBrailleLabel property

class StarRating extends HTMLElement {
  constructor() {
    super();
    this._internals = this.attachInternals();
    this._internals.ariaRole = "slider";
    this._internals.ariaBrailleLabel = this.ariaBrailleLabel;
  }

  // …
}

customElements.define("star-rating", StarRating);

<star-rating id="rate" aria-braillelabel="3">3 out of 5 stars</star-rating>

<pre id="log"></pre>

#log {
  height: 100px;
  overflow: scroll;
  padding: 0.5rem;
  border: 1px solid black;
}

const logInternals = document.querySelector("#log");
function log(text) {
  logInternals.innerText = `${logInternals.innerText}${text}\n`;
  logInternals.scrollTop = logInternals.scrollHeight;
}

const el = document.querySelector("star-rating");
log(el._internals.ariaBrailleLabel);
el._internals.ariaBrailleLabel += "*";
log(el._internals.ariaBrailleLabel);