js code for a11y toggle

js/app.js

@@ -58,6 +58,28 @@
 	}
   });
   
+// accessibility toggle
+  
+  const STORAGE_KEY = 'extra-css-enabled';
+  
+  function applyOverrideState(enabled) {
+	const link = document.getElementById('a11y-css');
+	const button = document.getElementById('a11y-toggle');
+	if (!link) return;
+  
+	link.disabled = !enabled;
+	button?.setAttribute('aria-pressed', String(enabled));
+  }
+  
+  const enabled = localStorage.getItem(STORAGE_KEY) === 'true';
+  applyOverrideState(enabled);
+  
+  document.getElementById('a11y-toggle')?.addEventListener('click', () => {
+	const nextState = localStorage.getItem(STORAGE_KEY) !== 'true';
+	localStorage.setItem(STORAGE_KEY, String(nextState));
+	applyOverrideState(nextState);
+  });
+  
 // light-dark toggle
   
   const STORAGE_KEY = 'theme-preference';