function createInvokerSync({ clickHandler = () => {}, width = 100, height = 20 }) {
  return /** @type {HTMLDivElement} */ (
    fixtureSync(html`
      <div
        role="button"
        style="width: ${width}px; height: ${height}px; background: red; color: white;"
        @click=${clickHandler}
      >
        Invoker
      </div>
    `)
  );
}
Make sure we never use a native button element, since its dimensions
are not cross browser consistent
For debugging purposes, add colors...
@param {{clickHandler?: function; width?: number; height?: number}} opts