Convert Deeply Nested HTML to Clean Markdown

Nested HTML to Markdown

Real-world HTML is rarely flat — it contains deeply nested <div>, <span>, <section>, and other container elements. Converting these to clean Markdown requires intelligent flattening.

The Nesting Problem

<div class="article">
  <div class="content">
    <div class="section">
      <h2>Introduction</h2>
      <div class="body">
        <p>This is a <span class="highlight"><strong>deeply nested</strong></span> paragraph.</p>
      </div>
    </div>
  </div>
</div>

Should convert to:

## Introduction

This is a **deeply nested** paragraph.

The converter must strip all container elements (<div>, <span>, <section>) that have no Markdown equivalent and extract only the meaningful content.

Semantic Containers

Some HTML containers carry semantic meaning:

• <article> — strip the tag, keep content
• <section> — strip the tag, keep content
• <aside> — may convert to a blockquote or be marked with a note prefix
• <figure> + <figcaption> — convert to image with caption text below
• <details> + <summary> — no standard Markdown equivalent; some converters output raw HTML

Handling div Wrappers

<div class="warning">
  <p><strong>Warning:</strong> Do not delete this file.</p>
</div>

Since Markdown has no <div> equivalent, the wrapper is stripped:

**Warning:** Do not delete this file.

Some converters can be configured to convert specific CSS classes to blockquotes or other Markdown structures.

Whitespace Between Nested Elements

A critical challenge is managing whitespace. Multiple nested containers can produce excessive blank lines:

<div>
  <div>
    <p>Text</p>
  </div>
</div>

Good converters normalize whitespace to avoid output like multiple consecutive blank lines, collapsing them to a single blank line separator.

Inline Nesting

Multiple inline elements nested inside each other should be collapsed:

<span><span><strong>Bold text</strong></span></span>

Converts to:

**Bold text**