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Default revealjs link colour fails text contrast at normal sizes

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评估

难度
1/5
预计耗时
1 小时以内
新手友好度
88/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
scss
领域
accessibility, frontend

调研方向

检查 src/resources/formats/revealjs/quarto.scss 中 L40-L41 附近定义默认链接颜色的位置。渲染提供的 revealjs 示例，并对照默认背景检查页脚、较小文本和题注；当正常大小的链接满足 WCAG 4.5:1 的对比度要求时即表示完成。

由索引模型根据 Issue 内容生成。

描述

accessibility revealjs themes

I have:

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

Bug description

The default revealjs theme sets $link-color to #2a76dd. On the default #fff background, the contrast is 4.44:1. WCAG 2.2 SC 1.4.3 Contrast (Minimum) requires 4.5:1 for text that is not large.

Slide body text is 40px, so body links pass (large text needs 3:1). Links in smaller text fail, for example in the footer (18px, and 14px on a 320px viewport), in .smaller slides, and in captions.

The colour comes from quarto.scss L40-L41. axe reports this on the quarto.org revealjs demo footer.

Steps to reproduce

---
format: revealjs
footer: "[quarto.org](https://quarto.org)"
---

## Slide

See [the Quarto website](https://quarto.org).
  1. Render the file.
  2. Measure the footer link colour against the slide background.

Actual behavior

The footer link is #2a76dd on #fff, at 4.44:1. Blue quarto.org text on white background

Expected behavior

The default link colour gives at least 4.5:1 on the default background.

AI helped investigate this issue. The investigation used a local clone of quarto-cli (see "Using AI tools to investigate" in CONTRIBUTING.md).

Your environment

  • IDE: Positron 1.134.0
  • OS: macOS 26.6.2 (build 25G83)

Quarto check output

Quarto 1.11.4

[✓] Checking environment information...
      Quarto cache location: /Users/charlottewickham/Library/Caches/quarto

[✓] 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: 1.11.4
      Path: /Applications/quarto/bin


[✓] Checking tools....................OK
      TinyTeX: v2026.04
      Chrome Headless Shell: 150.0.7871.115
      VeraPDF: 1.28.2


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


[✓] Checking Chrome Headless....................OK
      Using: Chrome Headless Shell installed by Quarto
      Path: /Users/charlottewickham/Library/Application Support/quarto/chrome-headless-shell/chrome-headless-shell-mac-arm64/chrome-headless-shell
      Version: 150.0.7871.115


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


[✓] Checking R installation...........OK
      Version: 4.6.0
      Path: /Library/Frameworks/R.framework/Versions/4.6/Resources
      LibPaths:
        - /Users/charlottewickham/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: 3.12.2
      Path: /Users/charlottewickham/.pyenv/versions/3.12.2/bin/python3
      Jupyter: 5.9.1
      Kernels: python3


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


[✓] Checking Julia installation...
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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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