Use standard form buttons and resume entrance effects in 1.10.1

public/assets/motion.js

@@ -26,10 +26,19 @@ export function initMotion(doc = document) {
   const observer = new view.IntersectionObserver(entries => {
     for (const entry of entries) if (entry.isIntersecting) { show(entry.target); observer.unobserve(entry.target); }
   }, { threshold: 0, rootMargin: '0px 0px -24px 0px' });
-  if (!preference.matches) nodes.forEach(node => observer.observe(node));
-  const reduce = () => { if (preference.matches) { observer.disconnect(); animations.forEach(animation => animation.cancel()); } };
-  preference.addEventListener('change', reduce);
-  return () => { observer.disconnect(); animations.forEach(animation => animation.cancel()); preference.removeEventListener('change', reduce); };
+  const syncPreference = () => {
+    if (preference.matches) {
+      observer.disconnect();
+      animations.forEach(animation => animation.cancel());
+    } else {
+      // Reduction may have been active at startup or enabled during this visit.
+      // Resume observing unseen content when movement is allowed again.
+      nodes.forEach(node => { if (!seen.has(node)) observer.observe(node); });
+    }
+  };
+  preference.addEventListener('change', syncPreference);
+  syncPreference();
+  return () => { observer.disconnect(); animations.forEach(animation => animation.cancel()); preference.removeEventListener('change', syncPreference); };
 }
 
 if (!document.querySelector('#editor')) initMotion();