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Fix theme transition flash on page navigation

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- Add immediate theme application in <head> section for all pages
- Prevents light mode flash when navigating in dark mode
- Script executes before body renders to apply saved theme
- Fixes flash when going from privacy policy back to home
- Maintains consistent theme experience across all pages
- Supports auto theme detection based on system preference
This commit is contained in:
Deco Vander 2025-07-05 18:47:05 -04:00
parent 6347c1de40
commit d20ce03264
3 changed files with 41 additions and 77 deletions
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14
public/index.html
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@ -8,6 +8,18 @@
<link rel="icon" type="image/x-icon" href="data:image/svg+xml;base64,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">
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
<link rel="stylesheet" href="style.css">
<script>
// Apply theme immediately to prevent flash
(function() {
const savedTheme = localStorage.getItem('theme') || 'auto';
if (savedTheme === 'auto') {
const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
document.documentElement.setAttribute('data-theme', prefersDark ? 'dark' : 'light');
} else {
document.documentElement.setAttribute('data-theme', savedTheme);
}
})();
</script>
</head>
<body>
<div class="container">
@ -109,6 +121,8 @@ placeholder="Enter address, intersection (e.g., Main St & Second St, City), or l
</div>
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
<!-- Load shared theme utility -->
<script src="theme-utils.js"></script>
<script src="utils.js"></script>
<script src="app-mapbox.js"></script>
</body>