Typst CSS misinterprets 0px border when color is specified as `rgb()`

[cwickham]

I have:

• searched the issue tracker for similar issues
• installed the latest version of Quarto CLI
• formatted my issue following the Bug Reports guide

Bug description

A border: <width> solid <color> declaration on an HTML table cell loses its width when the color is given in functional notation (rgb(...) or rgba(...)) — the resulting Typst stroke uses a 2.25pt default thickness instead of the declared width.

Steps to reproduce

---
title: "Untitled"
format: 
  typst:
    keep-typ: true
  html: default
---


```{=html}
<table>
  <tr>
    <td style="border: 0px solid red">named color</td>
    <td style="border: 0px solid #ff0000">hex color</td>
    <td style="border: 0px solid rgb(255, 0, 0)">rgb color</td>
    <td style="border: 0px solid rgba(255, 0, 0, 1.00)">rgba color</td>
  </tr>
</table>
```

Actual behavior

Resulting .typ:

#table(
  columns: 4,
  align: (auto,auto,auto,auto,),
  [named color], [hex color], table.cell(stroke: (paint: rgb(255, 0, 0), thickness: 2.25pt))[rgb color], table.cell(stroke: (paint: rgb(255, 0, 0, 100%), thickness: 2.25pt))[rgba color],
)

Expected behavior

Resulting .typ:

#table(
  columns: 4,
  align: (auto,auto,auto,auto,),
  [named color], [hex color], [rgb color], [rgba color],
)

Your environment

No response

Quarto check output

quarto check
Quarto 1.9.36
[✓] Checking environment information...
      Quarto cache location: /Users/charlottewickham/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.8.3: OK
      Dart Sass version 1.87.0: OK
      Deno version 2.4.5: OK
      Typst version 0.14.2: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.9.36
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2026.04
      VeraPDF: 1.28.2
      Chromium: (not installed)
      Chrome Headless Shell: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/charlottewickham/Library/TinyTeX/bin/universal-darwin
      Version: 2026

[✓] Checking Chrome Headless....................OK
      Using: Chrome found on system
      Path: /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
      Source: MacOS known location

[✓] Checking basic markdown render....OK

[✓] Checking R installation...........OK
      Version: 4.4.3
      Path: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources
      LibPaths:
        - /Users/charlottewickham/Library/R/arm64/4.4/library
        - /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library
      knitr: 1.51
      rmarkdown: 2.31

[✓] Checking Knitr engine render......OK

[✓] Checking Python 3 installation....OK
      Version: 3.13.2
      Path: /Users/charlottewickham/.local/share/uv/python/cpython-3.13.2-macos-aarch64-none/bin/python
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

[✓] Checking Julia installation...