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diff --git a/testing/web-platform/tests/interfaces/css-properties-values-api.idl b/testing/web-platform/tests/interfaces/css-properties-values-api.idl
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+++ b/testing/web-platform/tests/interfaces/css-properties-values-api.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 Properties and Values API Level 1 (https://drafts.css-houdini.org/css-properties-values-api-1/)
+
+dictionary PropertyDefinition {
+  required DOMString name;
+           DOMString syntax       = "*";
+  required boolean   inherits;
+           DOMString initialValue;
+};
+
+partial namespace CSS {
+  undefined registerProperty(PropertyDefinition definition);
+};
+
+[Exposed=Window]
+interface CSSPropertyRule : CSSRule {
+    readonly attribute CSSOMString name;
+    readonly attribute CSSOMString syntax;
+    readonly attribute boolean inherits;
+    readonly attribute CSSOMString? initialValue;
+};