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diff --git a/test/wpt/tests/interfaces/custom-state-pseudo-class.idl b/test/wpt/tests/interfaces/custom-state-pseudo-class.idl
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+++ b/test/wpt/tests/interfaces/custom-state-pseudo-class.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Custom State Pseudo Class (https://wicg.github.io/custom-state-pseudo-class/)
+
+partial interface ElementInternals {
+  readonly attribute CustomStateSet states;
+};
+
+[Exposed=Window]
+interface CustomStateSet {
+  setlike<DOMString>;
+  undefined add(DOMString value);
+};