
https://cards-dev.twitter.com/validator

Use this link:

https://alison-bookdown.netlify.com/






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# .fancy[03:00 minutes]
&lt;br&gt;
### Add new YAML metadata tags to your `index.Rmd`, and re-render your book.


Ideas:

+ Add [url, cover-image, description, github-repo](#meta)

.blue[.fancy[Hint:] see all possible Pandoc EPUB metadata parameters [here](https://pandoc.org/MANUAL.html#epub-metadata).]

]


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