Squashed 'themes/tabi-lean/' content from commit efb4246

git-subtree-dir: themes/tabi-lean
git-subtree-split: efb42461fde7ee5b0c140d27f2789fdf9c98b100

static/js/initializeTheme.js

@@ -0,0 +1,25 @@
+(function () {
+    // Get the default theme from the HTML data-theme attribute.
+    const defaultTheme = document.documentElement.getAttribute('data-theme');
+
+    // Set the data-default-theme attribute only if defaultTheme is not null.
+    if (defaultTheme) {
+        document.documentElement.setAttribute('data-default-theme', defaultTheme);
+    }
+
+    // Attempt to retrieve the current theme from the browser's local storage.
+    const storedTheme = localStorage.getItem('theme');
+
+    if (storedTheme) {
+        document.documentElement.setAttribute('data-theme', storedTheme);
+    } else if (defaultTheme) {
+        document.documentElement.setAttribute('data-theme', defaultTheme);
+    } else {
+        // If no theme is found in local storage and no default theme is set, use user's system preference.
+        const isSystemDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+        document.documentElement.setAttribute(
+            'data-theme',
+            isSystemDark ? 'dark' : 'light'
+        );
+    }
+})();