diff --git a/index.src.html b/index.src.html
index 49e76b43..97dc1e76 100644
--- a/index.src.html
+++ b/index.src.html
@@ -3838,7 +3838,7 @@
     When invoked, run these steps:
     1. If {{platform object/[[Detached]]}} is `true`, throw an
         {{InvalidStateError}} {{DOMException}}.
-    2. If {{VideoFrame/[[format]]}} is `null`, throw a {{NotSupportedError}}
+    2. If {{VideoFrame/[[format]]}} is `null` and |options|.{{VideoFrameCopyToOptions/format}} does not [=map/exist=], throw a {{NotSupportedError}}
         {{DOMException}}.
     3. Let |combinedLayout| be the result of running the [=Parse
         VideoFrameCopyToOptions=] algorithm with |options|.
@@ -3857,7 +3857,7 @@
     When invoked, run these steps:
     1. If {{platform object/[[Detached]]}} is `true`, return a promise rejected
         with a {{InvalidStateError}} {{DOMException}}.
-    2. If {{VideoFrame/[[format]]}} is `null`, return a promise rejected with a
+    2. If {{VideoFrame/[[format]]}} is `null` and |options|.{{VideoFrameCopyToOptions/format}} does not [=map/exist=], return a promise rejected with a
         {{NotSupportedError}} {{DOMException}}.
     3. Let |combinedLayout| be the result of running the [=Parse
         VideoFrameCopyToOptions=] algorithm with |options|.