<textarea id="area" style="width:80%;height:60px">
Focus on me, the cursor will be at position 10.
</textarea>

<script>
  area.onfocus = () => {
    // 设置零延迟 setTimeout 以在浏览器 "focus" 行为完成后运行
    setTimeout(() => {
      // 我们可以设置任何选择
      // 如果 start=end,则光标就会在该位置
      area.selectionStart = area.selectionEnd = 10;
    });
  };
</script>
document.getElementsByTagName("h1")[0].style.fontSize = "6vw";

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