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Boolean Attributes Treated Inconsistently #14553

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Boolean Attributes Treated Inconsistently#14553
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- P2: has workaroundAn edge case that only affects very specific usage, but has a trivial workaround (priority)good first issueGood for newcomers. If you need additional guidance, feel free to post in #contribute on Discord
@fweth

Description

@fweth
fweth
opened on Oct 16, 2025

Astro Info

Astro                    v5.14.5

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

No response

Describe the Bug

I have this simple template:

---
const test1 = {
  playsinline: "",
  muted: "",
  autoplay: "",
  foo: ""
}
const test2 = {
  playsinline: true,
  muted: true,
  autoplay: true,
  foo: true
}

---

<html lang="en">
  <head>...</head>
  <body>
    <video {...test1}></video>
    <video {...test2}></video>
  </body>
</html>

The outcome is this:

<body>
  <video muted="" foo=""></video>
  <video playsinline="" muted="true" autoplay="" foo="true"></video>
</body>

So weirdly some attributes are treated different than others. And some get lost in the first case, which should never happen.

What's the expected result?

All attributes are treated equally (whether true should resolve in "" or "true" is up to debate, but make it consistent).

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-k4fy4q3c?file=src%2Fpages%2Findex.astro

Participation

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

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    - P2: has workaroundAn edge case that only affects very specific usage, but has a trivial workaround (priority)good first issueGood for newcomers. If you need additional guidance, feel free to post in #contribute on Discord

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