To create an intricate multi-level list using HTML and CSS, one can utilize nested ul (unordered list) and li (list item) elements. This hierarchical structure accurately represents the chapters and titles. Here is a sample implementation:
<!DOCTYPE html>
<html>
<head>
<title>Multi-Level List Example</title>
<style>
ul,
li {
list-style: none;
padding: 0;
margin: 0;
}
.chapter-list {
counter-reset: chapter;
}
.chapter-list>li:before {
counter-increment: chapter;
content: counter(chapter) ". ";
}
.title-list {
counter-reset: title;
margin-left: 20px;
}
.title-list>li:before {
counter-increment: title;
content: counter(chapter) "." counter(title) " ";
}
.sub-title-list {
counter-reset: sub-title;
margin-left: 40px;
}
.sub-title-list>li:before {
counter-increment: sub-title;
content: counter(chapter) "." counter(title) "." counter(sub-title) " ";
}
</style>
</head>
<body>
<ul class="chapter-list">
<li>Chapter 1</li>
<li>Chapter 2
<ul class="title-list">
<li>Title 1</li>
<li>Title 2
<ul class="sub-title-list">
<li>Sub 1</li>
</ul>
</li>
</ul>
</li>
<li>Chapter 3</li>
</ul>
</body>
</html>