Astro breaks download attribute in <a> tags in MDX files

[dschuessler]

Astro Info

Astro                    v5.5.4
Node                     v20.19.0
System                   macOS (arm64)
Package Manager          bun
Output                   static
Adapter                  none
Integrations             auto-import
                         astro-expressive-code
                         @astrojs/mdx

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

If this...

<a href="https://astro.build/_astro/astro-cap.jt5HlOg8_12GvP4.webp" download>Download</a>

...turns up in an MDX file processed by Astro, it is turned into this...

<a href="https://astro.build/_astro/astro-cap.jt5HlOg8_12GvP4.webp" download="true">Download</a>

Since the value of the download attribute determines the name of the downloaded file, the file name is astro-cap.jt5HlOg8_12GvP4.webp in the first case but true.webp in the second.

I cannot reproduce this using the MDX playground, so I guess it is an Astro bug.

Potentially related PR: https://github.com/withastro/astro/pull/12584/files

What's the expected result?

Astro does not change the name of downloaded files to "true" by changing the download attribute in <a> tags.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-p68my6rx?file=src%2Fpages%2Findex.astro

Participation

• I am willing to submit a pull request for this issue.