1 files changed, 7 insertions, 6 deletions
diff --git a/testing/web-platform/tests/tools/webdriver/webdriver/bidi/modules/script.py b/testing/web-platform/tests/tools/webdriver/webdriver/bidi/modules/script.py
index 737426a5d5..01855766d8 100644
--- a/testing/web-platform/tests/tools/webdriver/webdriver/bidi/modules/script.py
+++ b/testing/web-platform/tests/tools/webdriver/webdriver/bidi/modules/script.py
@@ -3,6 +3,7 @@ from typing import Any, Dict, List, Mapping, MutableMapping, Optional, Union
 
 from ..error import UnknownErrorException
 from ._module import BidiModule, command
+from ..undefined import UNDEFINED, Undefined
 
 
 class ScriptEvaluateResultException(Exception):
@@ -78,15 +79,15 @@ Target = Union[RealmTarget, ContextTarget]
 class SerializationOptions(Dict[str, Any]):
     def __init__(
             self,
-            max_dom_depth: Optional[int] = None,
-            max_object_depth: Optional[int] = None,
-            include_shadow_tree: Optional[str] = None
+            max_dom_depth: Union[Optional[int], Undefined] = UNDEFINED,
+            max_object_depth: Union[Optional[int], Undefined] = UNDEFINED,
+            include_shadow_tree: Union[Optional[str], Undefined] = UNDEFINED
     ):
-        if max_dom_depth is not None:
+        if max_dom_depth is not UNDEFINED:
             self["maxDomDepth"] = max_dom_depth
-        if max_object_depth is not None:
+        if max_object_depth is not UNDEFINED:
             self["maxObjectDepth"] = max_object_depth
-        if include_shadow_tree is not None:
+        if include_shadow_tree is not UNDEFINED and include_shadow_tree is not None:
             self["includeShadowTree"] = include_shadow_tree