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diff --git a/testing/web-platform/tests/interfaces/css-nesting.idl b/testing/web-platform/tests/interfaces/css-nesting.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Nesting Module (https://drafts.csswg.org/css-nesting-1/)
+
+partial interface CSSStyleRule {
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+};