diff --git a/static/js/cursor.js b/static/js/cursor.js
index aa5c5d1..1abe353 100644
--- a/static/js/cursor.js
+++ b/static/js/cursor.js
@@ -50,4 +50,9 @@
   document.addEventListener("mouseleave", hide, { passive: true });
   window.addEventListener("blur", hide);
   window.addEventListener("pagehide", hide);
+  // over a cross-origin iframe (vimeo, doom) we get no mousemove, so hide ours
+  // instead of leaving it frozen at the edge; it returns on the next move out
+  document.addEventListener("mouseover", function (e) {
+    if (e.target && e.target.tagName === "IFRAME") hide();
+  }, true);
 })();