diff --git a/third_party/blink/renderer/core/testing/internals.cc b/third_party/blink/renderer/core/testing/internals.cc
index 45ea7ce84fce9..6481f1d0bde36 100644
--- a/third_party/blink/renderer/core/testing/internals.cc
+++ b/third_party/blink/renderer/core/testing/internals.cc
@@ -1298,20 +1298,25 @@ void Internals::setMarker(Document* document,
     return;
   }
 
-  if (type != DocumentMarker::kSpelling && type != DocumentMarker::kGrammar) {
-    exception_state.ThrowDOMException(DOMExceptionCode::kSyntaxError,
-                                      "internals.setMarker() currently only "
-                                      "supports spelling and grammar markers; "
-                                      "attempted to add marker of type '" +
-                                          marker_type + "'.");
-    return;
-  }
+  // if (type != DocumentMarker::kSpelling && type != DocumentMarker::kGrammar) {
+  //   exception_state.ThrowDOMException(DOMExceptionCode::kSyntaxError,
+  //                                     "internals.setMarker() currently only "
+  //                                     "supports spelling and grammar markers; "
+  //                                     "attempted to add marker of type '" +
+  //                                         marker_type + "'.");
+  //   return;
+  // }
 
   document->UpdateStyleAndLayout(DocumentUpdateReason::kTest);
   if (type == DocumentMarker::kSpelling)
     document->Markers().AddSpellingMarker(EphemeralRange(range));
-  else
+  else if (type == DocumentMarker::kGrammar)
     document->Markers().AddGrammarMarker(EphemeralRange(range));
+  else
+    document->Markers().AddSuggestionMarker(EphemeralRange(range),
+        SuggestionMarkerProperties::Builder()
+            .SetUnderlineColor(Color::kBlack)
+            .Build());
 }
 
 unsigned Internals::markerCountForNode(Text* text,