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arrow-dark gives region markers a light band that fails contrast

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Avaliação

Dificuldade
1/5
Tempo estimado
Menos de uma hora
Facilidade para iniciantes
88/100
Tipo de issue
Bug
Clareza
Claramente especificada
Status de atividade
Ativa
Stack de tecnologia
javascript
Domínio
accessibility

Direção de pesquisa

Comece por src/resources/pandoc/highlight-styles/arrow-dark.theme, o arquivo de tema vinculado na issue, e examine a regra RegionMarker. Remova o fundo claro para que os marcadores usem o fundo escuro do bloco de código. O trabalho estará concluído quando code span.re renderizado não tiver mais a faixa quase branca e o texto ciano estiver legível sobre o fundo escuro.

Escrita pelo modelo de indexação a partir do texto da issue.

Descrição

accessibility bug themes
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

The arrow-dark highlighting theme gives the RegionMarker token a background of #f8f8f2 and a text colour of #00e0e0.
That pair has a contrast ratio of 1.54:1, far below the 4.5:1 of WCAG 2.2 Success Criterion 1.4.3.
axe-core reports it as color-contrast, impact serious.

Every other token of arrow-dark takes only a text colour and sits on the code block.
The light band looks like a leftover from a light theme.

Region markers show up in C and C++ (//BEGIN and //END) and in other KDE syntaxes.

Related: #14090 (arrow-dark has no code block background, see https://github.com/quarto-dev/quarto-cli/issues/14090#issuecomment-3945376236) and #14135 (inline code does not use the theme background).
This one is a token-level background inside the theme file, so it stays even once the code block has a background.

Steps to reproduce
---
title: "arrow-dark RegionMarker contrast"
format:
  html:
    theme:
      light: default
      dark: darkly
    respect-user-color-scheme: true
    syntax-highlighting:
      light: arrow-light
      dark: arrow-dark
---

```cpp
//BEGIN region
int x = 1;
//END
```

Render it, open it with the system in dark mode, and inspect code span.re.
Quarto 1.10.19 and the current development build both produce this stylesheet.
The theme file is the same in the 1.11.7 pre-release.

Actual behavior

The dark highlighting stylesheet has:

code span.re {
  background-color: #f8f8f2;
  color: #00e0e0;
}

Both markers compute to rgb(0, 224, 224) on rgb(248, 248, 242), which is 1.54:1.

Dark mode code block: the //BEGIN region and //END lines show cyan text on a near-white band, while the other tokens sit on the dark background

Expected behavior

The region markers are readable in dark mode.
Dropping background-color from RegionMarker in arrow-dark.theme puts #00e0e0 on the dark code block, like the other tokens.

Your environment
  • OS: macOS (Darwin 27.0.0, Apple Silicon).
  • Browser: Brave (Chromium).
Quarto check output
Quarto 99.9.9

[✓] Checking environment information...
      Quarto cache location: /Users/mcanouil/Library/Caches/quarto
      Project: none found (single-file mode)

[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.10.0: OK
      Dart Sass version 1.101.0: OK
      Deno version 2.7.14: OK
      Typst version 0.15.1: OK

[✓] Checking versions of quarto dependencies......OK

[✓] Checking Quarto installation......OK
      Version: 99.9.9
      commit: 2bd9f23c90b6ba1be8bde5fb8f4e5d0d1b1878fa
      Path: /Users/mcanouil/Projects/quarto-dev/quarto-cli/package/dist/bin

[✓] Checking tools....................OK
      TinyTeX: v2026.07
      Chrome Headless Shell: (not installed)
      VeraPDF: (not installed)

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

[✓] Checking Chrome Headless....................OK
      Using: Chrome from QUARTO_CHROMIUM
      Path: /Applications/Brave Browser.app/Contents/MacOS/Brave Browser

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

ℹ R version 4.6.1 (2026-06-24)
! Config '~/.Rprofile' was loaded!

[✓] Checking R installation...........OK
      Version: 4.6.1
      Path: /Library/Frameworks/R.framework/Versions/4.6/Resources
      LibPaths:
        - /Users/mcanouil/Library/R/arm64/4.6/library
        - /Library/Frameworks/R.framework/Versions/4.6/Resources/library
      knitr: 1.51
      rmarkdown: 2.31

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

[✓] Checking Python 3 installation....OK
      Version: 3.9.6
      Path: /Library/Developer/CommandLineTools/usr/bin/python3
      Jupyter: (None)

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

[✓] Checking Julia installation...
Linguagem predominante
JavaScript
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Forks
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Merge médio
16h 42min
PRs com merge (30d)
115

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