If you want to report a bug, please provide the following information:

• The steps to reproduce.

1. 转到 https://valine.js.org/
2. 输入以下内容

<input type="checkbox" onfocus="alert(1)" autofocus="">

3. 点击发送
4. 浏览器新建一个标签页转到百度，然后转到https://valine.js.org/ 标签页
   ，或者直接点击提交的 checkbox

5.效果

• A minimal demo of the problem via https://jsfiddle.net or http://codepen.io/pen if possible.
  https://valine.js.org/
• Which versions of Valine, and which browser / OS are affected by this issue?
  当前版本
  all/all