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diff --git a/testing/web-platform/tests/interfaces/fs.idl b/testing/web-platform/tests/interfaces/fs.idl
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+++ b/testing/web-platform/tests/interfaces/fs.idl
@@ -0,0 +1,97 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: File System Standard (https://fs.spec.whatwg.org/)
+
+enum FileSystemHandleKind {
+  "file",
+  "directory",
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemHandle {
+  readonly attribute FileSystemHandleKind kind;
+  readonly attribute USVString name;
+
+  Promise<boolean> isSameEntry(FileSystemHandle other);
+};
+
+dictionary FileSystemCreateWritableOptions {
+  boolean keepExistingData = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemFileHandle : FileSystemHandle {
+  Promise<File> getFile();
+  Promise<FileSystemWritableFileStream> createWritable(optional FileSystemCreateWritableOptions options = {});
+  [Exposed=DedicatedWorker]
+  Promise<FileSystemSyncAccessHandle> createSyncAccessHandle();
+};
+
+dictionary FileSystemGetFileOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemGetDirectoryOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemRemoveOptions {
+  boolean recursive = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemDirectoryHandle : FileSystemHandle {
+  async iterable<USVString, FileSystemHandle>;
+
+  Promise<FileSystemFileHandle> getFileHandle(USVString name, optional FileSystemGetFileOptions options = {});
+  Promise<FileSystemDirectoryHandle> getDirectoryHandle(USVString name, optional FileSystemGetDirectoryOptions options = {});
+
+  Promise<undefined> removeEntry(USVString name, optional FileSystemRemoveOptions options = {});
+
+  Promise<sequence<USVString>?> resolve(FileSystemHandle possibleDescendant);
+};
+
+enum WriteCommandType {
+  "write",
+  "seek",
+  "truncate",
+};
+
+dictionary WriteParams {
+  required WriteCommandType type;
+  unsigned long long? size;
+  unsigned long long? position;
+  (BufferSource or Blob or USVString)? data;
+};
+
+typedef (BufferSource or Blob or USVString or WriteParams) FileSystemWriteChunkType;
+
+[Exposed=(Window,Worker), SecureContext]
+interface FileSystemWritableFileStream : WritableStream {
+  Promise<undefined> write(FileSystemWriteChunkType data);
+  Promise<undefined> seek(unsigned long long position);
+  Promise<undefined> truncate(unsigned long long size);
+};
+
+dictionary FileSystemReadWriteOptions {
+  [EnforceRange] unsigned long long at = 0;
+};
+
+[Exposed=DedicatedWorker, SecureContext]
+interface FileSystemSyncAccessHandle {
+  unsigned long long read([AllowShared] BufferSource buffer,
+                          optional FileSystemReadWriteOptions options = {});
+  unsigned long long write([AllowShared] BufferSource buffer,
+                           optional FileSystemReadWriteOptions options = {});
+
+  undefined truncate([EnforceRange] unsigned long long newSize);
+  unsigned long long getSize();
+  undefined flush();
+  undefined close();
+};
+
+[SecureContext]
+partial interface StorageManager {
+  Promise<FileSystemDirectoryHandle> getDirectory();
+};