Use theme-aware SVG favicon for Predbat web UI#3935
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springfall2008 merged 2 commits intoMay 30, 2026
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jim-ip
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May 17, 2026
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Minor changes made to smooth out some of the vector curves where there were some indentations
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Pull request overview
This PR updates Predbat’s web UI favicon to be theme-aware by preferring an SVG icon that adapts to light/dark mode, while keeping the existing PNG as a fallback for browsers that don’t support SVG favicons.
Changes:
- Added a new theme-aware favicon asset:
docs/images/bat_logo.svg(CSS switches fills based onprefers-color-scheme). - Updated
get_header_html()to emit an SVG favicon<link>before the existing PNG favicon<link>.
Reviewed changes
Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| docs/images/bat_logo.svg | Adds a theme-aware SVG logo that switches light/dark rendering via prefers-color-scheme. |
| apps/predbat/web_helper.py | Adds an SVG favicon <link> ahead of the existing PNG favicon to enable theme-aware rendering with fallback. |
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Summary
Predbat currently uses
bat_logo_light.pngas the web favicon in both light mode and dark mode.On dark browser tab backgrounds this results in a dark icon on a dark background because the favicon does not adapt to the active colour scheme.
Changes
docs/images/bat_logo.svgas a theme-aware favicon assetapps/predbat/web_helper.pyto use the SVG favicon firstbat_logo_light.pngas a PNG fallbackCurrent behaviour
The HTML currently emits:
So both light mode and dark mode use the same light-mode PNG favicon.
Proposed behavior
The HTML will emit:
This allows supported browsers to use the theme-aware SVG favicon while preserving PNG fallback compatibility.