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

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Valutazione

Difficoltà
2/5
Tempo stimato
1-3 ore
Idoneità per principianti
85/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
bootstrap, javascript, sass
Ambito
accessibility, frontend

Direzione di ricerca

Inizia dal modello di incorporamento collegato in src/resources/formats/html/embed/template.html, in particolare dalle righe 126–129, e ispeziona il relativo blocco di stili e l’h6 all’interno di #quarto-embed-header.bg-primary. Riproduci il problema con l’impostazione personalizzata del tema $headings-color fornita e l’esempio di incorporamento del notebook. Il lavoro è completato quando il titolo corrisponde al testo bianco del pulsante indietro e ha un contrasto sufficiente sullo sfondo primario.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

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
Lingua principale
JavaScript
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6.1k
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Merge medio
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PR unite (30g)
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