Update index.html

index.html

@@ -2263,7 +2263,7 @@ const socket = io("https://web-socket-server-14ap.onrender.com", {
                     timeMarkers.forEach(marker => {
                             const markerElement = document.createElement('div');
                             markerElement.className = 'time-marker';
-                            markerElement.textContent = `<b>${marker.label}</b>(${marker.time}秒)`;
+                            markerElement.innerHTML = `<b>${marker.label}</b>(${marker.time}秒)`;
                             markerElement.dataset.time = marker.time;
             
                             // ドラッグ開始