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-rw-r--r--components/script_bindings/webidls/TestBinding.webidl3
1 files changed, 3 insertions, 0 deletions
diff --git a/components/script_bindings/webidls/TestBinding.webidl b/components/script_bindings/webidls/TestBinding.webidl
index f2c45313228..33ba2f41fbb 100644
--- a/components/script_bindings/webidls/TestBinding.webidl
+++ b/components/script_bindings/webidls/TestBinding.webidl
@@ -627,3 +627,6 @@ dictionary NotUsedAnyWhereElse {};
dictionary RecordFieldWithUnionInside {
record<USVString, (USVString or NotUsedAnyWhereElse)> recordWithUnionField;
};
+
+// https://github.com/servo/servo/issues/28679
+typedef (USVString or undefined) UnionWithUndefinedVariant;