diff --git a/crates/web-sys/Cargo.toml b/crates/web-sys/Cargo.toml
index 704cf02b16a..2f7246d8a7a 100644
--- a/crates/web-sys/Cargo.toml
+++ b/crates/web-sys/Cargo.toml
@@ -382,13 +382,24 @@ FilePropertyBag = []
 FileReader = ["EventTarget"]
 FileReaderSync = []
 FileSystem = []
+FileSystemCreateWritableOptions = []
 FileSystemDirectoryEntry = ["FileSystemEntry"]
+FileSystemDirectoryHandle = ["FileSystemHandle"]
 FileSystemDirectoryReader = []
 FileSystemEntriesCallback = []
 FileSystemEntry = []
 FileSystemEntryCallback = []
 FileSystemFileEntry = ["FileSystemEntry"]
+FileSystemFileHandle = ["FileSystemHandle"]
 FileSystemFlags = []
+FileSystemGetDirectoryOptions = []
+FileSystemGetFileOptions = []
+FileSystemHandle = []
+FileSystemHandleKind = []
+FileSystemReadWriteOptions = []
+FileSystemRemoveOptions = []
+FileSystemSyncAccessHandle = []
+FileSystemWritableFileStream = ["WritableStream"]
 FillMode = []
 FlashClassification = []
 FlexLineGrowthState = []
@@ -1526,6 +1537,8 @@ WorkletOptions = []
 WritableStream = []
 WritableStreamDefaultController = []
 WritableStreamDefaultWriter = []
+WriteCommandType = []
+WriteParams = []
 XPathExpression = []
 XPathNsResolver = []
 XPathResult = []
diff --git a/crates/web-sys/src/features/gen_FileSystemCreateWritableOptions.rs b/crates/web-sys/src/features/gen_FileSystemCreateWritableOptions.rs
new file mode 100644
index 00000000000..ad28434e900
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemCreateWritableOptions.rs
@@ -0,0 +1,57 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemCreateWritableOptions)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemCreateWritableOptions` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemCreateWritableOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemCreateWritableOptions;
+}
+#[cfg(web_sys_unstable_apis)]
+impl FileSystemCreateWritableOptions {
+    #[doc = "Construct a new `FileSystemCreateWritableOptions`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemCreateWritableOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new() -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `keepExistingData` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemCreateWritableOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn keep_existing_data(&mut self, val: bool) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(
+            self.as_ref(),
+            &JsValue::from("keepExistingData"),
+            &JsValue::from(val),
+        );
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
+#[cfg(web_sys_unstable_apis)]
+impl Default for FileSystemCreateWritableOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemDirectoryHandle.rs b/crates/web-sys/src/features/gen_FileSystemDirectoryHandle.rs
new file mode 100644
index 00000000000..b9092fd6e00
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemDirectoryHandle.rs
@@ -0,0 +1,113 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = FileSystemHandle , extends = :: js_sys :: Object , js_name = FileSystemDirectoryHandle , typescript_type = "FileSystemDirectoryHandle")]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemDirectoryHandle` class."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemDirectoryHandle;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = getDirectoryHandle)]
+    #[doc = "The `getDirectoryHandle()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/getDirectoryHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_directory_handle(this: &FileSystemDirectoryHandle, name: &str) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemGetDirectoryOptions")]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = getDirectoryHandle)]
+    #[doc = "The `getDirectoryHandle()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/getDirectoryHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`, `FileSystemGetDirectoryOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_directory_handle_with_options(
+        this: &FileSystemDirectoryHandle,
+        name: &str,
+        options: &FileSystemGetDirectoryOptions,
+    ) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = getFileHandle)]
+    #[doc = "The `getFileHandle()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/getFileHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_file_handle(this: &FileSystemDirectoryHandle, name: &str) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemGetFileOptions")]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = getFileHandle)]
+    #[doc = "The `getFileHandle()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/getFileHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`, `FileSystemGetFileOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_file_handle_with_options(
+        this: &FileSystemDirectoryHandle,
+        name: &str,
+        options: &FileSystemGetFileOptions,
+    ) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = removeEntry)]
+    #[doc = "The `removeEntry()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn remove_entry(this: &FileSystemDirectoryHandle, name: &str) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemRemoveOptions")]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = removeEntry)]
+    #[doc = "The `removeEntry()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`, `FileSystemRemoveOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn remove_entry_with_options(
+        this: &FileSystemDirectoryHandle,
+        name: &str,
+        options: &FileSystemRemoveOptions,
+    ) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemDirectoryHandle" , js_name = resolve)]
+    #[doc = "The `resolve()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/resolve)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemDirectoryHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn resolve(
+        this: &FileSystemDirectoryHandle,
+        possible_descendant: &FileSystemHandle,
+    ) -> ::js_sys::Promise;
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemFileHandle.rs b/crates/web-sys/src/features/gen_FileSystemFileHandle.rs
new file mode 100644
index 00000000000..af16b279ad5
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemFileHandle.rs
@@ -0,0 +1,66 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = FileSystemHandle , extends = :: js_sys :: Object , js_name = FileSystemFileHandle , typescript_type = "FileSystemFileHandle")]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemFileHandle` class."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemFileHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemFileHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemFileHandle;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemFileHandle" , js_name = createSyncAccessHandle)]
+    #[doc = "The `createSyncAccessHandle()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemFileHandle/createSyncAccessHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemFileHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn create_sync_access_handle(this: &FileSystemFileHandle) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemFileHandle" , js_name = createWritable)]
+    #[doc = "The `createWritable()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemFileHandle/createWritable)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemFileHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn create_writable(this: &FileSystemFileHandle) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemCreateWritableOptions")]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemFileHandle" , js_name = createWritable)]
+    #[doc = "The `createWritable()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemFileHandle/createWritable)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemCreateWritableOptions`, `FileSystemFileHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn create_writable_with_options(
+        this: &FileSystemFileHandle,
+        options: &FileSystemCreateWritableOptions,
+    ) -> ::js_sys::Promise;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemFileHandle" , js_name = getFile)]
+    #[doc = "The `getFile()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemFileHandle/getFile)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemFileHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_file(this: &FileSystemFileHandle) -> ::js_sys::Promise;
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemGetDirectoryOptions.rs b/crates/web-sys/src/features/gen_FileSystemGetDirectoryOptions.rs
new file mode 100644
index 00000000000..c971fbe4841
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemGetDirectoryOptions.rs
@@ -0,0 +1,54 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemGetDirectoryOptions)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemGetDirectoryOptions` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetDirectoryOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemGetDirectoryOptions;
+}
+#[cfg(web_sys_unstable_apis)]
+impl FileSystemGetDirectoryOptions {
+    #[doc = "Construct a new `FileSystemGetDirectoryOptions`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetDirectoryOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new() -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `create` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetDirectoryOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn create(&mut self, val: bool) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r =
+            ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("create"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
+#[cfg(web_sys_unstable_apis)]
+impl Default for FileSystemGetDirectoryOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemGetFileOptions.rs b/crates/web-sys/src/features/gen_FileSystemGetFileOptions.rs
new file mode 100644
index 00000000000..bda0bec4e87
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemGetFileOptions.rs
@@ -0,0 +1,54 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemGetFileOptions)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemGetFileOptions` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetFileOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemGetFileOptions;
+}
+#[cfg(web_sys_unstable_apis)]
+impl FileSystemGetFileOptions {
+    #[doc = "Construct a new `FileSystemGetFileOptions`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetFileOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new() -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `create` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemGetFileOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn create(&mut self, val: bool) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r =
+            ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("create"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
+#[cfg(web_sys_unstable_apis)]
+impl Default for FileSystemGetFileOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemHandle.rs b/crates/web-sys/src/features/gen_FileSystemHandle.rs
new file mode 100644
index 00000000000..602999b7100
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemHandle.rs
@@ -0,0 +1,52 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemHandle , typescript_type = "FileSystemHandle")]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemHandle` class."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemHandle;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemHandleKind")]
+    # [wasm_bindgen (structural , method , getter , js_class = "FileSystemHandle" , js_name = kind)]
+    #[doc = "Getter for the `kind` field of this object."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/kind)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemHandle`, `FileSystemHandleKind`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn kind(this: &FileSystemHandle) -> FileSystemHandleKind;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (structural , method , getter , js_class = "FileSystemHandle" , js_name = name)]
+    #[doc = "Getter for the `name` field of this object."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/name)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn name(this: &FileSystemHandle) -> String;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemHandle" , js_name = isSameEntry)]
+    #[doc = "The `isSameEntry()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/isSameEntry)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn is_same_entry(this: &FileSystemHandle, other: &FileSystemHandle) -> ::js_sys::Promise;
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemHandleKind.rs b/crates/web-sys/src/features/gen_FileSystemHandleKind.rs
new file mode 100644
index 00000000000..7165864dd42
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemHandleKind.rs
@@ -0,0 +1,15 @@
+#![allow(unused_imports)]
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+#[doc = "The `FileSystemHandleKind` enum."]
+#[doc = ""]
+#[doc = "*This API requires the following crate features to be activated: `FileSystemHandleKind`*"]
+#[doc = ""]
+#[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+#[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum FileSystemHandleKind {
+    File = "file",
+    Directory = "directory",
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemReadWriteOptions.rs b/crates/web-sys/src/features/gen_FileSystemReadWriteOptions.rs
new file mode 100644
index 00000000000..b3b2b8125d6
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemReadWriteOptions.rs
@@ -0,0 +1,53 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemReadWriteOptions)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemReadWriteOptions` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemReadWriteOptions;
+}
+#[cfg(web_sys_unstable_apis)]
+impl FileSystemReadWriteOptions {
+    #[doc = "Construct a new `FileSystemReadWriteOptions`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new() -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `at` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn at(&mut self, val: f64) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("at"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
+#[cfg(web_sys_unstable_apis)]
+impl Default for FileSystemReadWriteOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemRemoveOptions.rs b/crates/web-sys/src/features/gen_FileSystemRemoveOptions.rs
new file mode 100644
index 00000000000..bc25023fb7f
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemRemoveOptions.rs
@@ -0,0 +1,57 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemRemoveOptions)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemRemoveOptions` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemRemoveOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemRemoveOptions;
+}
+#[cfg(web_sys_unstable_apis)]
+impl FileSystemRemoveOptions {
+    #[doc = "Construct a new `FileSystemRemoveOptions`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemRemoveOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new() -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `recursive` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemRemoveOptions`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn recursive(&mut self, val: bool) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(
+            self.as_ref(),
+            &JsValue::from("recursive"),
+            &JsValue::from(val),
+        );
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
+#[cfg(web_sys_unstable_apis)]
+impl Default for FileSystemRemoveOptions {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemSyncAccessHandle.rs b/crates/web-sys/src/features/gen_FileSystemSyncAccessHandle.rs
new file mode 100644
index 00000000000..8bc8224c59e
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemSyncAccessHandle.rs
@@ -0,0 +1,199 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = FileSystemSyncAccessHandle , typescript_type = "FileSystemSyncAccessHandle")]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemSyncAccessHandle` class."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemSyncAccessHandle;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = close)]
+    #[doc = "The `close()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/close)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn close(this: &FileSystemSyncAccessHandle);
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = flush)]
+    #[doc = "The `flush()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/flush)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn flush(this: &FileSystemSyncAccessHandle) -> Result<(), JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = getSize)]
+    #[doc = "The `getSize()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/getSize)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_size(this: &FileSystemSyncAccessHandle) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = read)]
+    #[doc = "The `read()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/read)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn read_with_buffer_source(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &::js_sys::Object,
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = read)]
+    #[doc = "The `read()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/read)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn read_with_u8_array(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &mut [u8],
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemReadWriteOptions")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = read)]
+    #[doc = "The `read()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/read)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`, `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn read_with_buffer_source_and_options(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &::js_sys::Object,
+        options: &FileSystemReadWriteOptions,
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemReadWriteOptions")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = read)]
+    #[doc = "The `read()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/read)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`, `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn read_with_u8_array_and_options(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &mut [u8],
+        options: &FileSystemReadWriteOptions,
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = truncate)]
+    #[doc = "The `truncate()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/truncate)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn truncate_with_u32(
+        this: &FileSystemSyncAccessHandle,
+        new_size: u32,
+    ) -> Result<(), JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = truncate)]
+    #[doc = "The `truncate()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/truncate)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn truncate_with_f64(
+        this: &FileSystemSyncAccessHandle,
+        new_size: f64,
+    ) -> Result<(), JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_buffer_source(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &::js_sys::Object,
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_u8_array(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &mut [u8],
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemReadWriteOptions")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`, `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_buffer_source_and_options(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &::js_sys::Object,
+        options: &FileSystemReadWriteOptions,
+    ) -> Result<f64, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "FileSystemReadWriteOptions")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemSyncAccessHandle" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemReadWriteOptions`, `FileSystemSyncAccessHandle`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_u8_array_and_options(
+        this: &FileSystemSyncAccessHandle,
+        buffer: &mut [u8],
+        options: &FileSystemReadWriteOptions,
+    ) -> Result<f64, JsValue>;
+}
diff --git a/crates/web-sys/src/features/gen_FileSystemWritableFileStream.rs b/crates/web-sys/src/features/gen_FileSystemWritableFileStream.rs
new file mode 100644
index 00000000000..fdc461253ec
--- /dev/null
+++ b/crates/web-sys/src/features/gen_FileSystemWritableFileStream.rs
@@ -0,0 +1,146 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = WritableStream , extends = :: js_sys :: Object , js_name = FileSystemWritableFileStream , typescript_type = "FileSystemWritableFileStream")]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `FileSystemWritableFileStream` class."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type FileSystemWritableFileStream;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = seek)]
+    #[doc = "The `seek()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/seek)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn seek_with_u32(
+        this: &FileSystemWritableFileStream,
+        position: u32,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = seek)]
+    #[doc = "The `seek()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/seek)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn seek_with_f64(
+        this: &FileSystemWritableFileStream,
+        position: f64,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = truncate)]
+    #[doc = "The `truncate()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/truncate)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn truncate_with_u32(
+        this: &FileSystemWritableFileStream,
+        size: u32,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = truncate)]
+    #[doc = "The `truncate()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/truncate)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn truncate_with_f64(
+        this: &FileSystemWritableFileStream,
+        size: f64,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_buffer_source(
+        this: &FileSystemWritableFileStream,
+        data: &::js_sys::Object,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_u8_array(
+        this: &FileSystemWritableFileStream,
+        data: &mut [u8],
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "Blob")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `Blob`, `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_blob(
+        this: &FileSystemWritableFileStream,
+        data: &Blob,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_str(
+        this: &FileSystemWritableFileStream,
+        data: &str,
+    ) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "WriteParams")]
+    # [wasm_bindgen (catch , method , structural , js_class = "FileSystemWritableFileStream" , js_name = write)]
+    #[doc = "The `write()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemWritableFileStream/write)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `FileSystemWritableFileStream`, `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn write_with_write_params(
+        this: &FileSystemWritableFileStream,
+        data: &WriteParams,
+    ) -> Result<::js_sys::Promise, JsValue>;
+}
diff --git a/crates/web-sys/src/features/gen_StorageManager.rs b/crates/web-sys/src/features/gen_StorageManager.rs
index 9901c79509c..9d76bd3f929 100644
--- a/crates/web-sys/src/features/gen_StorageManager.rs
+++ b/crates/web-sys/src/features/gen_StorageManager.rs
@@ -18,6 +18,17 @@ extern "C" {
     #[doc = ""]
     #[doc = "*This API requires the following crate features to be activated: `StorageManager`*"]
     pub fn estimate(this: &StorageManager) -> Result<::js_sys::Promise, JsValue>;
+    #[cfg(web_sys_unstable_apis)]
+    # [wasm_bindgen (method , structural , js_class = "StorageManager" , js_name = getDirectory)]
+    #[doc = "The `getDirectory()` method."]
+    #[doc = ""]
+    #[doc = "[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/StorageManager/getDirectory)"]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `StorageManager`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn get_directory(this: &StorageManager) -> ::js_sys::Promise;
     # [wasm_bindgen (catch , method , structural , js_class = "StorageManager" , js_name = persist)]
     #[doc = "The `persist()` method."]
     #[doc = ""]
diff --git a/crates/web-sys/src/features/gen_WriteCommandType.rs b/crates/web-sys/src/features/gen_WriteCommandType.rs
new file mode 100644
index 00000000000..68a413d7a2e
--- /dev/null
+++ b/crates/web-sys/src/features/gen_WriteCommandType.rs
@@ -0,0 +1,16 @@
+#![allow(unused_imports)]
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+#[doc = "The `WriteCommandType` enum."]
+#[doc = ""]
+#[doc = "*This API requires the following crate features to be activated: `WriteCommandType`*"]
+#[doc = ""]
+#[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+#[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum WriteCommandType {
+    Write = "write",
+    Seek = "seek",
+    Truncate = "truncate",
+}
diff --git a/crates/web-sys/src/features/gen_WriteParams.rs b/crates/web-sys/src/features/gen_WriteParams.rs
new file mode 100644
index 00000000000..85c346bd226
--- /dev/null
+++ b/crates/web-sys/src/features/gen_WriteParams.rs
@@ -0,0 +1,105 @@
+#![allow(unused_imports)]
+use super::*;
+use wasm_bindgen::prelude::*;
+#[cfg(web_sys_unstable_apis)]
+#[wasm_bindgen]
+extern "C" {
+    # [wasm_bindgen (extends = :: js_sys :: Object , js_name = WriteParams)]
+    #[derive(Debug, Clone, PartialEq, Eq)]
+    #[doc = "The `WriteParams` dictionary."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub type WriteParams;
+}
+#[cfg(web_sys_unstable_apis)]
+impl WriteParams {
+    #[cfg(feature = "WriteCommandType")]
+    #[doc = "Construct a new `WriteParams`."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteCommandType`, `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn new(type_: WriteCommandType) -> Self {
+        #[allow(unused_mut)]
+        let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
+        ret.type_(type_);
+        ret
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `data` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn data(&mut self, val: Option<&::wasm_bindgen::JsValue>) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("data"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `position` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn position(&mut self, val: Option<f64>) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(
+            self.as_ref(),
+            &JsValue::from("position"),
+            &JsValue::from(val),
+        );
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[doc = "Change the `size` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn size(&mut self, val: Option<f64>) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("size"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+    #[cfg(web_sys_unstable_apis)]
+    #[cfg(feature = "WriteCommandType")]
+    #[doc = "Change the `type` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WriteCommandType`, `WriteParams`*"]
+    #[doc = ""]
+    #[doc = "*This API is unstable and requires `--cfg=web_sys_unstable_apis` to be activated, as"]
+    #[doc = "[described in the `wasm-bindgen` guide](https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html)*"]
+    pub fn type_(&mut self, val: WriteCommandType) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("type"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
+}
diff --git a/crates/web-sys/src/features/mod.rs b/crates/web-sys/src/features/mod.rs
index 74b67838508..e56624a0f6f 100644
--- a/crates/web-sys/src/features/mod.rs
+++ b/crates/web-sys/src/features/mod.rs
@@ -2110,12 +2110,24 @@ mod gen_FileSystem;
 #[cfg(feature = "FileSystem")]
 pub use gen_FileSystem::*;
 
+#[cfg(feature = "FileSystemCreateWritableOptions")]
+#[allow(non_snake_case)]
+mod gen_FileSystemCreateWritableOptions;
+#[cfg(feature = "FileSystemCreateWritableOptions")]
+pub use gen_FileSystemCreateWritableOptions::*;
+
 #[cfg(feature = "FileSystemDirectoryEntry")]
 #[allow(non_snake_case)]
 mod gen_FileSystemDirectoryEntry;
 #[cfg(feature = "FileSystemDirectoryEntry")]
 pub use gen_FileSystemDirectoryEntry::*;
 
+#[cfg(feature = "FileSystemDirectoryHandle")]
+#[allow(non_snake_case)]
+mod gen_FileSystemDirectoryHandle;
+#[cfg(feature = "FileSystemDirectoryHandle")]
+pub use gen_FileSystemDirectoryHandle::*;
+
 #[cfg(feature = "FileSystemDirectoryReader")]
 #[allow(non_snake_case)]
 mod gen_FileSystemDirectoryReader;
@@ -2146,12 +2158,66 @@ mod gen_FileSystemFileEntry;
 #[cfg(feature = "FileSystemFileEntry")]
 pub use gen_FileSystemFileEntry::*;
 
+#[cfg(feature = "FileSystemFileHandle")]
+#[allow(non_snake_case)]
+mod gen_FileSystemFileHandle;
+#[cfg(feature = "FileSystemFileHandle")]
+pub use gen_FileSystemFileHandle::*;
+
 #[cfg(feature = "FileSystemFlags")]
 #[allow(non_snake_case)]
 mod gen_FileSystemFlags;
 #[cfg(feature = "FileSystemFlags")]
 pub use gen_FileSystemFlags::*;
 
+#[cfg(feature = "FileSystemGetDirectoryOptions")]
+#[allow(non_snake_case)]
+mod gen_FileSystemGetDirectoryOptions;
+#[cfg(feature = "FileSystemGetDirectoryOptions")]
+pub use gen_FileSystemGetDirectoryOptions::*;
+
+#[cfg(feature = "FileSystemGetFileOptions")]
+#[allow(non_snake_case)]
+mod gen_FileSystemGetFileOptions;
+#[cfg(feature = "FileSystemGetFileOptions")]
+pub use gen_FileSystemGetFileOptions::*;
+
+#[cfg(feature = "FileSystemHandle")]
+#[allow(non_snake_case)]
+mod gen_FileSystemHandle;
+#[cfg(feature = "FileSystemHandle")]
+pub use gen_FileSystemHandle::*;
+
+#[cfg(feature = "FileSystemHandleKind")]
+#[allow(non_snake_case)]
+mod gen_FileSystemHandleKind;
+#[cfg(feature = "FileSystemHandleKind")]
+pub use gen_FileSystemHandleKind::*;
+
+#[cfg(feature = "FileSystemReadWriteOptions")]
+#[allow(non_snake_case)]
+mod gen_FileSystemReadWriteOptions;
+#[cfg(feature = "FileSystemReadWriteOptions")]
+pub use gen_FileSystemReadWriteOptions::*;
+
+#[cfg(feature = "FileSystemRemoveOptions")]
+#[allow(non_snake_case)]
+mod gen_FileSystemRemoveOptions;
+#[cfg(feature = "FileSystemRemoveOptions")]
+pub use gen_FileSystemRemoveOptions::*;
+
+#[cfg(feature = "FileSystemSyncAccessHandle")]
+#[allow(non_snake_case)]
+mod gen_FileSystemSyncAccessHandle;
+#[cfg(feature = "FileSystemSyncAccessHandle")]
+pub use gen_FileSystemSyncAccessHandle::*;
+
+#[cfg(feature = "FileSystemWritableFileStream")]
+#[allow(non_snake_case)]
+mod gen_FileSystemWritableFileStream;
+#[cfg(feature = "FileSystemWritableFileStream")]
+pub use gen_FileSystemWritableFileStream::*;
+
 #[cfg(feature = "FillMode")]
 #[allow(non_snake_case)]
 mod gen_FillMode;
@@ -8974,6 +9040,18 @@ mod gen_WritableStreamDefaultWriter;
 #[cfg(feature = "WritableStreamDefaultWriter")]
 pub use gen_WritableStreamDefaultWriter::*;
 
+#[cfg(feature = "WriteCommandType")]
+#[allow(non_snake_case)]
+mod gen_WriteCommandType;
+#[cfg(feature = "WriteCommandType")]
+pub use gen_WriteCommandType::*;
+
+#[cfg(feature = "WriteParams")]
+#[allow(non_snake_case)]
+mod gen_WriteParams;
+#[cfg(feature = "WriteParams")]
+pub use gen_WriteParams::*;
+
 #[cfg(feature = "XPathExpression")]
 #[allow(non_snake_case)]
 mod gen_XPathExpression;
diff --git a/crates/web-sys/webidls/unstable/FileSystemAccess.webidl b/crates/web-sys/webidls/unstable/FileSystemAccess.webidl
new file mode 100644
index 00000000000..cc5623bdb19
--- /dev/null
+++ b/crates/web-sys/webidls/unstable/FileSystemAccess.webidl
@@ -0,0 +1,101 @@
+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 {
+  [Throws]
+  Promise<undefined> write(FileSystemWriteChunkType data);
+  [Throws]
+  Promise<undefined> seek(unsigned long long position);
+  [Throws]
+  Promise<undefined> truncate(unsigned long long size);
+};
+
+dictionary FileSystemReadWriteOptions {
+  [EnforceRange] unsigned long long at;
+};
+
+[Exposed=DedicatedWorker, SecureContext]
+interface FileSystemSyncAccessHandle {
+  [Throws]
+  unsigned long long read([AllowShared] BufferSource buffer,
+                          optional FileSystemReadWriteOptions options = {});
+  [Throws]
+  unsigned long long write([AllowShared] BufferSource buffer,
+                           optional FileSystemReadWriteOptions options = {});
+
+  [Throws]
+  undefined truncate([EnforceRange] unsigned long long newSize);
+  [Throws]
+  unsigned long long getSize();
+  [Throws]
+  undefined flush();
+  undefined close();
+};
+
+
+[SecureContext]
+partial interface StorageManager {
+  Promise<FileSystemDirectoryHandle> getDirectory();
+};