How to automatically add comments to the first line of HTML

Question

Similar to the picture, you cannot see the first line of comments when opening it with an editor. How is this generated?

Answer 1

You can create document fragments through js code

Create and generate comments

var name = document.createComment() //创建注释
var farme = document.createDocumentFragment('frame');//创建文档片段
farme .appendChild(name)