eslint-plugin-mark

Appearance

require-image-title

⭐ CommonMark 🌟 GFM

🔗 Rule Source 🔗 Test Source

Enforce the use of title attribute for images.

Rule Details ​

This rule enforces the use of title attributes for all images in Markdown documents. Having title attributes on images provides additional context and can improve accessibility by offering supplementary information when hovering over an image.

The rule examines all image elements in a Markdown document and reports any images that lack a title attribute. It checks:

  • Standard Markdown image syntax: ![alt text](url "title")
  • Image reference definitions: [ref]: url "title"
  • HTML image tags: <img src="url" alt="alt text" title="title">

Examples ​

❌ Incorrect ​

Examples of incorrect code for this rule:

Default ​

md
<!-- eslint mark/require-image-title: "error" -->


![Alt text](https://example.com/image.png)



<img src="https://example.com/image.png" alt="Alt text">


<div>
  
<img src="https://example.com/image.png" alt="Alt text">

</div>

![Alt text][reference]


[reference]: https://example.com/image.png

✅ Correct ​

Examples of correct code for this rule:

Default ​

md
<!-- eslint mark/require-image-title: "error" -->

![Alt text](https://example.com/image.png "Image title")

<img src="https://example.com/image.png" alt="Alt text" title="Image title">

<div>
  <img src="https://example.com/image.png" alt="Alt text" title="Image title">
</div>

![Alt text][reference]

[reference]: https://example.com/image.png "Image title"

NOTE

Please note that this rule doesn't report definition-style comments (e.g., [//]: ...) by default.

md
<!-- eslint mark/require-image-title: "error" -->

![Alt text][//]

[//]: https://example.com/image.png

With { allowDefinitions: ['reference'] } Option ​

md
<!-- eslint mark/require-image-title: ["error", { allowDefinitions: ['reference'] }] -->

![Alt text][reference]

[reference]: https://example.com/image.png

Options ​

js
'mark/require-image-title': ['error', {
  allowDefinitions: ['//'],
}]

allowDefinitions ​

Type: string[] / Default: ['//']

When specified, specific definitions are allowed if they match one of the identifiers in this array. This is useful for ignoring definitions that are intentionally left without titles, such as comments or placeholders.

When Not To Use It ​

You might want to disable this rule if:

  • Your documentation style guide doesn't require image titles.
  • You're working with legacy documentation where adding titles to all images would be impractical.
  • You're using a documentation system that provides alternative methods for image descriptions or captions.