diff --git a/plugin/contents/ui/dancer.html b/plugin/contents/ui/dancer.html
index 536ee35..c85ce4b 100644
--- a/plugin/contents/ui/dancer.html
+++ b/plugin/contents/ui/dancer.html
@@ -951,8 +951,6 @@ function drawStars(ts) {
 }
 
 window.addEventListener('resize', resizeCanvas);
-resizeCanvas();
-requestAnimationFrame(drawStars);
 
 /* ============================================================
    FLOOR CANVAS — perspective grid with true vanishing point
@@ -1027,8 +1025,19 @@ function drawFloor(ts) {
 }
 
 window.addEventListener('resize', resizeFloor);
-resizeFloor();
-requestAnimationFrame(drawFloor);
+
+// WebEngine sometimes reports innerWidth=0 on first load — retry until valid.
+function initCanvases() {
+  if (window.innerWidth > 0 && window.innerHeight > 0) {
+    resizeCanvas();
+    resizeFloor();
+    requestAnimationFrame(drawStars);
+    requestAnimationFrame(drawFloor);
+  } else {
+    setTimeout(initCanvases, 80);
+  }
+}
+initCanvases();
 
 
 /* ============================================================