| Incorrect rendering of URL logos supplied to _brand.yml when rendering to HTML |
| ### Bug description |
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| When brand logos are supplied via a URL, quarto renders the URL in the HTML using `\` instead of `/`. This will appropriately show the logo when previewing the render locally, but when pushed to a GitHub Pages site the URL gets converted to a relative path based on the current website. For example, if I have a logo hosted at `https://mysite.github.io/branding/logos/example.png`, and I try to link to it in the `_brand.yml` at `https://mysite.github.io/mypage`, the URL embedded in the html will convert the logo URL to `https:\mysite.github.io\branding\logos\example.png`, which will try to redirect to `https://mysite.github.io/mysite.github.io/branding/logos/example.png` (real example shown in the screenshot) |
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| ### Steps to reproduce |
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| ````qmd |
| --- |
| title: "Reproducible Quarto Document" |
| format: html |
| brand: |
| logo: |
| images: |
| quarto-logo: |
| path:  |
| alt: "Quarto icon" |
| small: quarto-logo |
| --- |
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| This is a reproducible Quarto document using `format: html`. It is written in Markdown and contains embedded Python code. When you run the code, it will produce a message. |
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| {{< lipsum 1 >}} |
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| {{< brand logo small>}} |
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| The end. |
| ```` |
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| ### Actual behavior |
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| HTML renders the image as follows: `<img src="https:\quarto.org\quarto.png" class="img-fluid">` |
| When shown in a local preview, this renders the image correctly. When hosted on an external website using GitHub Pages, this appends the image URL to the website URL |
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| ### Expected behavior |
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| HTML renders the image with the full URL: `` |
| When shown on an external website in a browser, this should correctly render the image. |
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| ### Your environment |
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| - IDE: Positron 2025.05.0 build 58 |
| - OS: Windows 11 |
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| ### Quarto check output |
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| ``` |
| Quarto 1.7.29 |
| [>] Checking environment information... |
| Quarto cache location: C:\Users\Jonathan.Peake\AppData\Local\quarto |
| [>] Checking versions of quarto binary dependencies... |
| Pandoc version 3.6.3: OK |
| Dart Sass version 1.85.1: OK |
| Deno version 1.46.3: OK |
| Typst version 0.13.0: OK |
| [>] Checking versions of quarto dependencies......OK |
| [>] Checking Quarto installation......OK |
| Version: 1.7.29 |
| Path: C:\Users\Jonathan.Peake\AppData\Local\Programs\Quarto\bin |
| CodePage: 1252 |
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| [>] Checking tools....................OK |
| TinyTeX: (external install) |
| Chromium: (not installed) |
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| [>] Checking LaTeX....................OK |
| Using: TinyTex |
| Path: C:\Users\Jonathan.Peake\AppData\Roaming\TinyTeX\bin\windows\ |
| Version: 2025 |
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| [>] Checking Chrome Headless....................OK |
| Using: Chrome found on system |
| Path: C:\Program Files\Google\Chrome\Application\chrome.exe |
| Source: Windows Registry |
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| [>] Checking basic markdown render....OK |
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| [>] Checking Python 3 installation....OK |
| Version: 3.12.9 (Conda) |
| Path: C:/Users/Jonathan.Peake/AppData/Local/miniforge3/python.EXE |
| Jupyter: (None) |
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| Jupyter is not available in this Python installation. |
| Install with conda install jupyter |
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| [>] Checking R installation...........OK |
| Version: 4.4.2 |
| Path: C:/Users/Jonathan.Peake/AppData/Local/Programs/R/R-4.4.2 |
| LibPaths: |
| - C:/Users/Jonathan.Peake/AppData/Local/Programs/R/R-4.4.2/library |
| knitr: 1.50 |
| rmarkdown: 2.29 |
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| [>] Checking Knitr engine render......OK |
| ``` |
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| ## Relevant pre-fix discussion |
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| ### Issue #12643 |
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| #### Comment at 2025-04-29T18:50:18Z |
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| I also created a live GitHub Pages site from the reprex quarto file: https://jonpeake.github.io/quarto-reprex/reprex.html |
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| When accessed from site url: |
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| When previewing locally: |
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| #### Comment at 2025-04-29T22:43:45Z |
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| I followed the formatting used in this doc, which suggests that a URL is not only allowed but supported: |
| https://quarto.org/docs/authoring/brand.html |
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