.

Assets/New folder/WebGLVideoController.cs

+using UnityEngine;
+using UnityEngine.Video;
+
+public class WebGLVideoController : MonoBehaviour
+{
+    public VideoPlayer videoPlayer;
+    public string videoFileName = "intro.mp4";
+
+    void Start()
+    {
+        // WebGL requires URL from StreamingAssets
+        videoPlayer.source = VideoSource.Url;
+        videoPlayer.url = Application.streamingAssetsPath + "/" + videoFileName;
+
+        // Browser requires muted video
+        videoPlayer.audioOutputMode = VideoAudioOutputMode.Direct;
+        videoPlayer.SetDirectAudioMute(0, true);
+
+        videoPlayer.playOnAwake = false;
+        videoPlayer.waitForFirstFrame = true;
+
+        PlayVideo();
+    }
+
+    // Call this from a UI Button
+    public void PlayVideo()
+    {
+        if (!videoPlayer.isPlaying)
+        {
+            videoPlayer.Play();
+        }
+    }
+}

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Assets/Scenes/RockSimulation.unity

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