<!DOCTYPE html>
<html>
<head>
<style>
body {
counter-reset: section;
}
h1 {
counter-reset: subsection;
}
h1::before {
counter-increment: section;
content: "Section " counter(section) ". ";
}
h2::before {
counter-increment: subsection;
content: counter(section) "." counter(subsection) " ";
}
</style>
</head>
<body>
<h1>HTML/CSS Tutorials</h1>
<h2>HTML</h2>
<h2>CSS</h2>
<h2>Bootstrap</h2>
<h2>W3.CSS</h2>
<h1>Scripting Tutorials</h1>
<h2>JavaScript</h2>
<h2>jQuery</h2>
<h2>React</h2>
<h1>Programming Tutorials</h1>
<h2>Python</h2>
<h2>Java</h2>
<h2>C++</h2>
</body>
</html>