Below 2 files represent the same structure.
I call the S expression representation of the markup language
(especially with HTML) SEML and this package provides
the major mode and utility for that file.
SEML is *short* and *easy to understand* for Lisp hacker.
#+begin_src seml
(html ((lang . "en"))
(head nil
(meta ((charset . "utf-8")))
(title nil "sample page")
(link ((rel . "stylesheet") (href . "sample1.css"))))
(body nil
(h1 nil "sample")
(p nil "text sample")))
#+end_src
#+begin_src html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>sample page</title>
<link rel="stylesheet" href="sample1.css"/>
</head>
<body>
<h1>sample</h1>
<p>
text sample
</p>
</body>
</html>
#+end_src
More information at [[https://github.com/conao3/seml-mode.el][github]]
Sample configuration with [[https://github.com/conao3/leaf.el][leaf.el]]
(leaf seml-mode :ensure t)