Safari Issue

safari_issue.js

window.setTimeout(async() => {
  const o = new thing();
  await o.render();
}, 1);

class thing {
  render = async () => {
    const html = /*html*/`<button id="btn1">Test</button>`;
    document.body.innerHTML = html;
    const msg = "something here";
    document.getElementById("btn1").addEventListener("click", async () => {
      await this.#getData(msg);
    });
  }
  #getData = async (msg) => {
    const result = await fetch('https://jsonplaceholder.typicode.com/posts/1');
    console.log(msg);
    const data = await result.json();
    console.log(data);
  }
}