Notebook preview header title takes the heading colour on the primary background

Aberta Para iniciantes
  • Algo errado?
#15,306 0 comentários 0 reações 0 responsáveis Ver no GitHub

Mantenedores costumam responder em até 1 dia

Ninguém assumiu esta issue ainda.

Avaliação

Dificuldade
2/5
Tempo estimado
1-3 horas
Facilidade para iniciantes
85/100
Tipo de issue
Bug
Clareza
Claramente especificada
Status de atividade
Ativa
Stack de tecnologia
bootstrap, javascript, sass
Domínio
accessibility, frontend

Direção de pesquisa

Comece pelo template de incorporação vinculado em src/resources/formats/html/embed/template.html, especialmente pelas linhas 126–129, e inspecione seu bloco de estilos e o h6 dentro de #quarto-embed-header.bg-primary. Reproduza o problema com a configuração personalizada de tema fornecida $headings-color e o exemplo de incorporação de notebook. O trabalho estará concluído quando o título corresponder ao texto branco do botão de voltar e tiver contraste suficiente sobre o plano de fundo primário.

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

Descrição

accessibility bug embed
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 notebook preview page puts its title in an h6 inside #quarto-embed-header.bg-primary.
.bg-primary sets only the background, and Bootstrap gives every heading color: var(--bs-heading-color).
When a theme sets $headings-color, the title takes that colour on the primary background, while the back button next to it stays white.

With default, cosmo, flatly, and litera, $headings-color is unset, so the title inherits white and the problem does not show.
A theme or brand with dark heading ink is enough to break it.

Steps to reproduce

_quarto.yml:

project:
  type: website
website:
  title: "Embed header"
format:
  html:
    theme: [default, custom.scss]

custom.scss:

/*-- scss:defaults --*/
$headings-color: #1f2a37;

index.qmd:

---
title: "Embed header contrast"
---

{{< embed notebook.ipynb#answer >}}

notebook.ipynb holds one code cell with #| label: answer and a saved output.
Run quarto render and open _site/notebook-preview.html.

Actual behavior

Computed colours in Chromium 156:

header background  rgb(13, 110, 253)
h6 title           rgb(31, 42, 55)    3.23:1
back link button   rgb(255, 255, 255)

The title is 1.1em at weight 400, so it needs 4.5:1 under WCAG 2.2 Success Criterion 1.4.3.
With $primary: #47709a as well, the ratio drops to 2.81:1.

Expected behavior

The title uses the same colour as the back button beside it.
Adding #quarto-embed-header h6 { color: inherit; } to the page brings the title back to white (4.50:1 on the default primary).
That rule could sit in the style block of the embed template.

Before With color: inherit
Notebook preview header: the notebook title in dark ink on the blue primary bar, next to white buttons Notebook preview header: the notebook title in white like the buttons beside it
Your environment
  • IDE: none, command line.
  • OS: macOS 27.2.
  • Browser: Chromium 156.0.8078.4 (Playwright).
Quarto check output

Reproduced with a development build of main at 089ba530b.
The embed template is the same at the v1.11.9 tag.

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 1.107.1: OK
      Deno version 2.9.8: OK
      Typst version 0.15.1: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 99.9.9
      commit: 089ba530b3ed4ec156a355d41b6b7de2db3e44ea
      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
Linguagem predominante
JavaScript
Estrelas
6.1k
Forks
478
Merge médio
17h 58min
PRs com merge (30d)
135

Preparar o ambiente

Primeiros passos

  1. Leia a issue inteira e depois o guia de contribuição do projeto.
  2. Comente na issue dizendo que vai assumir — evita que duas pessoas façam o mesmo trabalho.
  3. Faça um fork do repositório e trabalhe em uma branch.
  4. Abra um pull request que referencie o número da issue.

Mais de quarto-dev/quarto-cli

Todas as issues de quarto-dev/quarto-cli

Issues semelhantes

Mais issues de JavaScript

Receba novas issues na sua caixa de entrada

Um resumo curto de issues do GitHub para quem está começando.