3 files changed, 9 insertions, 0 deletions
diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 51a4653279f..0aa15a8d5a6 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2000,6 +2000,7 @@ def UnionTypes(descriptors, dictionaries, callbacks, config):
         'dom::bindings::conversions::StringificationBehavior',
         'dom::bindings::error::throw_not_in_union',
         'dom::bindings::js::Root',
+        'dom::bindings::str::USVString',
         'dom::types::*',
         'js::jsapi::JSContext',
         'js::jsapi::{HandleValue, MutableHandleValue}',
@@ -3492,6 +3493,9 @@ def getUnionTypeTemplateVars(type, descriptorProvider):
     elif type.isDOMString():
         name = type.name
         typeName = "DOMString"
+    elif type.isUSVString():
+        name = type.name
+        typeName = "USVString"
     elif type.isPrimitive():
         name = type.name
         typeName = builtinNames[type.tag()]
diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index 7c2038eab3b..057b3c2172b 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -12,6 +12,8 @@ use dom::bindings::codegen::Bindings::TestBindingBinding::TestEnum::_empty;
 use dom::bindings::codegen::UnionTypes::BlobOrString;
 use dom::bindings::codegen::UnionTypes::EventOrString;
 use dom::bindings::codegen::UnionTypes::EventOrString::eString;
+use dom::bindings::codegen::UnionTypes::EventOrUSVString;
+use dom::bindings::codegen::UnionTypes::EventOrUSVString::eUSVString;
 use dom::bindings::codegen::UnionTypes::HTMLElementOrLong;
 use dom::bindings::codegen::UnionTypes::HTMLElementOrLong::eLong;
 use dom::bindings::global::{GlobalField, GlobalRef};
@@ -77,6 +79,8 @@ impl TestBindingMethods for TestBinding {
     fn SetUnionAttribute(&self, _: HTMLElementOrLong) {}
     fn Union2Attribute(&self) -> EventOrString { eString("".to_owned()) }
     fn SetUnion2Attribute(&self, _: EventOrString) {}
+    fn Union3Attribute(&self) -> EventOrUSVString { eUSVString(USVString("".to_owned())) }
+    fn SetUnion3Attribute(&self, _: EventOrUSVString) {}
     fn ArrayAttribute(&self, _: *mut JSContext) -> *mut JSObject { NullValue().to_object_or_null() }
     fn AnyAttribute(&self, _: *mut JSContext) -> JSVal { NullValue() }
     fn SetAnyAttribute(&self, _: *mut JSContext, _: HandleValue) {}
diff --git a/components/script/dom/webidls/TestBinding.webidl b/components/script/dom/webidls/TestBinding.webidl
index 181909721aa..f845be7dc15 100644
--- a/components/script/dom/webidls/TestBinding.webidl
+++ b/components/script/dom/webidls/TestBinding.webidl
@@ -89,6 +89,7 @@ interface TestBinding {
            attribute Blob interfaceAttribute;
            attribute (HTMLElement or long) unionAttribute;
            attribute (Event or DOMString) union2Attribute;
+           attribute (Event or USVString) union3Attribute;
   readonly attribute Uint8ClampedArray arrayAttribute;
            attribute any anyAttribute;
            attribute object objectAttribute;