Ai slop

lean/theme/theme-init.js

@@ -0,0 +1,24 @@
+/* Mathew's theme handshake with the wiki (see mathew.css, its stylesheet).
+ *
+ * The wiki opens this frame as ?theme=light|dark — the editor cannot see
+ * the page around it (another origin), but it can at least open wearing
+ * the same mood. Without the parameter — a direct visit — the browser's
+ * preference decides, the same rule lean4web follows for its own default.
+ *
+ * Runs synchronously in <head>, before the first paint, so the page never
+ * flashes the wrong palette; <html data-mathew-theme> is the hook the
+ * stylesheet's overrides hang on. */
+(function () {
+  var param = null
+  try {
+    param = new URLSearchParams(window.location.search).get('theme')
+  } catch (e) {
+    /* an engine without URLSearchParams gets the fallback below */
+  }
+  var theme = param === 'light' || param === 'dark'
+    ? param
+    : window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches
+      ? 'dark'
+      : 'light'
+  document.documentElement.setAttribute('data-mathew-theme', theme)
+})()