diff --git a/ed/idl/DOM-Parsing.idl b/ed/idl/DOM-Parsing.idl
deleted file mode 100644
index af2626079364..000000000000
--- a/ed/idl/DOM-Parsing.idl
+++ /dev/null
@@ -1,10 +0,0 @@
-// GENERATED CONTENT - DO NOT EDIT
-// Content was automatically extracted by Reffy into webref
-// (https://github.com/w3c/webref)
-// Source: DOM Parsing and Serialization (https://w3c.github.io/DOM-Parsing/)
-
-[Exposed=Window]
-interface XMLSerializer {
-  constructor();
-  DOMString serializeToString(Node root);
-};