rumdl 0.0.12

A fast Markdown linter written in Rust (Ru(st) MarkDown Linter)
Documentation 
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# MD051 - Link Fragments Should Be Valid

## Description

This rule ensures that link fragments (the part after the # in a link) point to valid headings in the  
document. This helps prevent broken internal links and improves navigation within Markdown documents.

<!-- markdownlint-disable -->
## Examples

### Valid

```markdown
# Introduction

## Getting Started

[Link to Getting Started](#getting-started)
```

### Invalid

```markdown
# Introduction

## Getting Started

[Link to non-existent heading](#installation)
```

### Fixed

```markdown
# Introduction

## Getting Started

## Installation

[Link to Installation](#installation)
```
<!-- markdownlint-enable -->

## Configuration

This rule has no configuration options.

## Special Cases

- This rule only applies to internal links with fragments (links that start with #)
- It does not apply to external links (links to other documents or websites)
- The rule checks if the fragment matches a heading in the document
- Heading IDs are generated by converting the heading text to lowercase and replacing spaces with hyphens
- Special characters in headings are removed when generating IDs
- The rule handles complex headings with punctuation, code spans, and emphasis

## Related Rules

- [MD042 - No empty links](md042.md): Ensures links have content
- [MD034 - No bare URLs](md034.md): Ensures URLs are properly formatted
- [MD039 - No space inside link text](md039.md): Ensures proper formatting of link text