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Generate Rules.md and md###.md files from metadata, improve Parameters documentation by referencing schema.

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David Anson 2022-10-29 23:21:45 -07:00
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This rule is triggered when an image is missing alternate text (alt text) information.
Alternate text is commonly specified inline as:
```markdown
![Alternate text](image.jpg)
```
Or with reference syntax as:
```markdown
![Alternate text][ref]
...
[ref]: image.jpg "Optional title"
```
Guidance for writing alternate text is available from the [W3C](https://www.w3.org/WAI/alt/),
[Wikipedia](https://en.wikipedia.org/wiki/Alt_attribute), and
[other locations](https://www.phase2technology.com/blog/no-more-excuses).
Rationale: Alternate text is important for accessibility and describes the
content of an image for people who may not be able to see it.