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Edit description of MD051/link-fragments to clarify that it implements the GitHub algorithm for creating section links (which converts to lowercase) (refs #591).

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David Anson 2022-11-05 16:49:38 -07:00
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@ -1,5 +1,5 @@
This rule is triggered when a link fragment does not correspond to a heading
in the document:
This rule is triggered when a link fragment does not match any of the fragments
that are automatically generated for headings in a document:
```markdown
# Title
@ -7,23 +7,36 @@ in the document:
[Link](#fragment)
```
To fix the issue, change the fragment to reference an existing heading:
To fix this issue, change the link fragment to reference an existing heading:
```markdown
# Title
[Link](#title)
```
Alternatively, an HTML `a` tag with an `id` (or a `name`) attribute defines a
valid anchor:
Alternatively, an HTML `a` tag with an `id` or a `name` attribute can be used to
define a fragment:
```markdown
<a id="fragment"></a>
<a id="bookmark"></a>
[Link](#bookmark)
```
Some platforms (e.g., [GitHub][github-section-links]) automatically create HTML
anchors for every heading. This makes it easy to link to different sections in
a document. These internal links can break over time as headings are renamed.
An `a` tag can be useful in scenarios where a heading is not appropriate or for
control over the text of the fragment identifier.
Note: Creating anchors for headings is not part of the CommonMark specification.
Rationale: [GitHub section links][github-section-links] are created automatically
for every heading when Markdown content is displayed on GitHub. This makes it
easy to link directly to different sections within a document. However, section
links change if headings are renamed or removed. This rule helps identify broken
section links within a document.
Section links are **not** part of the CommonMark specification. This rule
enforces the [GitHub heading algorithm][github-heading-algorithm] which is:
convert heading to lowercase, remove punctuation, convert spaces to dashes, append
an incrementing integer as needed for uniqueness.
[github-section-links]: https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#section-links
[github-heading-algorithm]: https://github.com/gjtorikian/html-pipeline/blob/main/lib/html/pipeline/toc_filter.rb