diff --git a/builtins/web/blob.cpp b/builtins/web/blob.cpp
index 8ab98f44..360b94e0 100644
--- a/builtins/web/blob.cpp
+++ b/builtins/web/blob.cpp
@@ -2,13 +2,15 @@
 #include "builtin.h"
 #include "encode.h"
 #include "extension-api.h"
-#include "mozilla/UniquePtr.h"
+#include "js/UniquePtr.h"
 #include "rust-encoding.h"
 #include "streams/native-stream-source.h"
 
+#include "mozilla/UniquePtr.h"
 #include "js/ArrayBuffer.h"
 #include "js/Conversions.h"
 #include "js/experimental/TypedData.h"
+#include "js/HashTable.h"
 #include "js/Stream.h"
 #include "js/TypeDecls.h"
 #include "js/Value.h"
@@ -149,6 +151,8 @@ namespace builtins {
 namespace web {
 namespace blob {
 
+using js::Vector;
+
 const JSFunctionSpec Blob::static_methods[] = {
     JS_FS_END,
 };
@@ -247,7 +251,7 @@ JSObject *Blob::data_to_owned_array_buffer(JSContext *cx, HandleObject self) {
 JSObject *Blob::data_to_owned_array_buffer(JSContext *cx, HandleObject self, size_t offset,
                                            size_t size, size_t *bytes_read) {
   auto blob = Blob::blob(self);
-  auto blob_size = blob->size();
+  auto blob_size = blob->length();
   *bytes_read = 0;
 
   MOZ_ASSERT(offset <= blob_size);
@@ -255,7 +259,7 @@ JSObject *Blob::data_to_owned_array_buffer(JSContext *cx, HandleObject self, siz
   size_t available_bytes = blob_size - offset;
   size_t read_size = std::min(size, available_bytes);
 
-  auto span = std::span<uint8_t>(blob->data() + offset, read_size);
+  auto span = std::span<uint8_t>(blob->begin() + offset, read_size);
   auto array_buffer = new_array_buffer_from_span(cx, span);
   if (!array_buffer) {
     return nullptr;
@@ -319,7 +323,7 @@ bool Blob::slice(JSContext *cx, unsigned argc, JS::Value *vp) {
   METHOD_HEADER(0)
 
   auto src = Blob::blob(self);
-  int64_t size = src->size();
+  int64_t size = src->length();
   int64_t start = 0;
   int64_t end = size;
 
@@ -350,11 +354,14 @@ bool Blob::slice(JSContext *cx, unsigned argc, JS::Value *vp) {
   start = (start < 0) ? std::max((size + start), 0LL) : std::min(start, size);
   end = (end < 0) ? std::max((size + end), 0LL) : std::min(end, size);
 
-  auto dst = (end - start > 0)
-                 ? std::make_unique<std::vector<uint8_t>>(src->begin() + start, src->begin() + end)
-                 : std::make_unique<std::vector<uint8_t>>();
+  auto slice_len = std::max(end - start, 0LL);
+  auto dst = (slice_len > 0) ? UniqueChars(js_pod_malloc<char>(slice_len)) : nullptr;
+
+  if (dst) {
+    std::copy(src->begin() + start, src->begin() + end, dst.get());
+  }
 
-  JS::RootedObject new_blob(cx, create(cx, std::move(dst), contentType));
+  JS::RootedObject new_blob(cx, create(cx, std::move(dst), slice_len, contentType));
   if (!new_blob) {
     return false;
   }
@@ -376,7 +383,7 @@ bool Blob::stream(JSContext *cx, unsigned argc, JS::Value *vp) {
 
   auto readers = Blob::readers(self);
   auto blob = Blob::blob(self);
-  auto span = std::span<uint8_t>(blob->data(), blob->size());
+  auto span = std::span<uint8_t>(blob->begin(), blob->length());
 
   if (!readers->put(source, BlobReader(span))) {
     return false;
@@ -408,7 +415,7 @@ bool Blob::text(JSContext *cx, unsigned argc, JS::Value *vp) {
   auto decoder = jsencoding::encoding_new_decoder_with_bom_removal(encoding);
   MOZ_ASSERT(decoder);
 
-  auto src_len = src->size();
+  auto src_len = src->length();
   auto dst_len = jsencoding::decoder_max_utf16_buffer_length(decoder, src_len);
 
   JS::UniqueTwoByteChars dst(new char16_t[dst_len + 1]);
@@ -420,7 +427,7 @@ bool Blob::text(JSContext *cx, unsigned argc, JS::Value *vp) {
   bool had_replacements;
   auto dst_data = reinterpret_cast<uint16_t *>(dst.get());
 
-  jsencoding::decoder_decode_to_utf16(decoder, src->data(), &src_len, dst_data, &dst_len, true,
+  jsencoding::decoder_decode_to_utf16(decoder, src->begin(), &src_len, dst_data, &dst_len, true,
                                       &had_replacements);
 
   JS::RootedString str(cx, JS_NewUCString(cx, std::move(dst), dst_len));
@@ -474,9 +481,9 @@ bool Blob::stream_pull(JSContext *cx, JS::CallArgs args, JS::HandleObject source
   return true;
 }
 
-std::vector<uint8_t> *Blob::blob(JSObject *self) {
+Blob::ByteBuffer *Blob::blob(JSObject *self) {
   MOZ_ASSERT(is_instance(self));
-  auto blob = static_cast<std::vector<uint8_t> *>(
+  auto blob = static_cast<ByteBuffer *>(
       JS::GetReservedSlot(self, static_cast<size_t>(Blob::Slots::Data)).toPrivate());
 
   MOZ_ASSERT(blob);
@@ -484,7 +491,7 @@ std::vector<uint8_t> *Blob::blob(JSObject *self) {
 }
 
 size_t Blob::blob_size(JSObject *self) {
-  return blob(self)->size();
+  return blob(self)->length();
 }
 
 JSString *Blob::type(JSObject *self) {
@@ -515,14 +522,16 @@ bool Blob::append_value(JSContext *cx, HandleObject self, HandleValue val) {
 
     if (Blob::is_instance(obj)) {
       auto src = Blob::blob(obj);
-      blob->insert(blob->end(), src->begin(), src->end());
-      return true;
+      return blob->append(src->begin(), src->end());
     } else if (JS_IsArrayBufferViewObject(obj) || JS::IsArrayBufferObject(obj)) {
       auto span = value_to_buffer(cx, val, "Blob Parts");
       if (span.has_value()) {
-        blob->insert(blob->end(), span->begin(), span->end());
+        auto src = span->data();
+        auto len = span->size();
+        return blob->append(src, src + len);
+      } else {
+        return true;
       }
-      return true;
     }
   } else if (val.isString()) {
     auto chars = core::encode(cx, val);
@@ -534,14 +543,13 @@ bool Blob::append_value(JSContext *cx, HandleObject self, HandleValue val) {
       auto converted = convert_line_endings_to_native(chars);
       auto src = converted.data();
       auto len = converted.length();
-      blob->insert(blob->end(), src, src + len);
+      return blob->append(src, src + len);
 
     } else {
       auto src = chars.ptr.get();
       auto len = chars.len;
-      blob->insert(blob->end(), src, src + len);
+      return blob->append(src, src + len);
     }
-    return true;
   }
 
   // FALLBACK: if we ever get here convert, to string and call append again
@@ -645,13 +653,19 @@ bool Blob::init_options(JSContext *cx, HandleObject self, HandleValue initv) {
   return true;
 }
 
-JSObject *Blob::create(JSContext *cx, std::unique_ptr<Blob::ByteBuffer> data, HandleString type) {
+JSObject *Blob::create(JSContext *cx, UniqueChars data, size_t data_len, HandleString type) {
   JSObject *self = JS_NewObjectWithGivenProto(cx, &class_, proto_obj);
   if (!self) {
     return nullptr;
   }
 
-  SetReservedSlot(self, static_cast<uint32_t>(Slots::Data), JS::PrivateValue(data.release()));
+  auto blob = new ByteBuffer;
+  if (data != nullptr) {
+    // Take the ownership of given data.
+    blob->replaceRawBuffer(reinterpret_cast<uint8_t *>(data.release()), data_len);
+  }
+
+  SetReservedSlot(self, static_cast<uint32_t>(Slots::Data), JS::PrivateValue(blob));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Type), JS::StringValue(type));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Endings), JS::Int32Value(LineEndings::Transparent));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Readers), JS::PrivateValue(new ReadersMap));
@@ -669,9 +683,9 @@ bool Blob::constructor(JSContext *cx, unsigned argc, JS::Value *vp) {
     return false;
   }
 
-  SetReservedSlot(self, static_cast<uint32_t>(Slots::Data), JS::PrivateValue(new std::vector<uint8_t>()));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Type), JS_GetEmptyStringValue(cx));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Endings), JS::Int32Value(LineEndings::Transparent));
+  SetReservedSlot(self, static_cast<uint32_t>(Slots::Data), JS::PrivateValue(new ByteBuffer));
   SetReservedSlot(self, static_cast<uint32_t>(Slots::Readers), JS::PrivateValue(new ReadersMap));
 
   // Walk the blob parts and append them to the blob's buffer.
diff --git a/builtins/web/blob.h b/builtins/web/blob.h
index 0a578598..8efe2d25 100644
--- a/builtins/web/blob.h
+++ b/builtins/web/blob.h
@@ -6,6 +6,7 @@
 #include "js/AllocPolicy.h"
 #include "js/GCHashTable.h"
 #include "js/TypeDecls.h"
+#include "js/Vector.h"
 
 namespace builtins {
 namespace web {
@@ -53,10 +54,9 @@ class Blob : public TraceableBuiltinImpl<Blob> {
   enum Slots { Data, Type, Endings, Readers, Count };
   enum LineEndings { Transparent, Native };
 
-  using ByteBuffer = std::vector<uint8_t>;
   using HeapObj = Heap<JSObject *>;
-  using ReadersMap =
-      JS::GCHashMap<HeapObj, BlobReader, js::StableCellHasher<HeapObj>, js::SystemAllocPolicy>;
+  using ByteBuffer = js::Vector<uint8_t, 0, js::SystemAllocPolicy>;
+  using ReadersMap = JS::GCHashMap<HeapObj, BlobReader, js::StableCellHasher<HeapObj>, js::SystemAllocPolicy>;
 
   static ReadersMap *readers(JSObject *self);
   static ByteBuffer *blob(JSObject *self);
@@ -75,7 +75,7 @@ class Blob : public TraceableBuiltinImpl<Blob> {
   static JSObject *data_to_owned_array_buffer(JSContext *cx, HandleObject self);
   static JSObject *data_to_owned_array_buffer(JSContext *cx, HandleObject self, size_t offset,
                                               size_t size, size_t *bytes_read);
-  static JSObject *create(JSContext *cx, std::unique_ptr<ByteBuffer> data, HandleString type);
+  static JSObject *create(JSContext *cx, UniqueChars data, size_t data_len, HandleString type);
 
   static bool init_class(JSContext *cx, HandleObject global);
   static bool constructor(JSContext *cx, unsigned argc, Value *vp);
diff --git a/builtins/web/fetch/request-response.cpp b/builtins/web/fetch/request-response.cpp
index 73ac3163..855b9aa5 100644
--- a/builtins/web/fetch/request-response.cpp
+++ b/builtins/web/fetch/request-response.cpp
@@ -1,5 +1,6 @@
 #include "request-response.h"
 
+#include "../blob.h"
 #include "../streams/native-stream-source.h"
 #include "../streams/transform-stream.h"
 #include "../url.h"
@@ -8,6 +9,7 @@
 #include "extension-api.h"
 #include "fetch_event.h"
 #include "host_api.h"
+#include "js/String.h"
 #include "picosha2.h"
 
 #include "js/Array.h"
@@ -25,6 +27,8 @@
 #include "js/experimental/TypedData.h"
 #pragma clang diagnostic pop
 
+using builtins::web::blob::Blob;
+
 namespace builtins::web::streams {
 
 bool NativeStreamSource::stream_is_body(JSContext *cx, JS::HandleObject stream) {
@@ -288,6 +292,7 @@ bool RequestOrResponse::extract_body(JSContext *cx, JS::HandleObject self,
   // We currently support five types of body inputs:
   // - byte sequence
   // - buffer source
+  // - Blob
   // - USV strings
   // - URLSearchParams
   // - ReadableStream
@@ -296,8 +301,24 @@ bool RequestOrResponse::extract_body(JSContext *cx, JS::HandleObject self,
   // TODO: Support the other possible inputs to Body.
 
   JS::RootedObject body_obj(cx, body_val.isObject() ? &body_val.toObject() : nullptr);
+  host_api::HostString host_type_str;
+
+  if (Blob::is_instance(body_obj)) {
+    RootedValue stream(cx);
+    if (!Call(cx, body_obj, "stream", HandleValueArray::empty(), &stream)) {
+      return false;
+    }
+
+    MOZ_ASSERT(stream.isObject());
+    JS_SetReservedSlot(self, static_cast<uint32_t>(RequestOrResponse::Slots::BodyStream), stream);
 
-  if (body_obj && JS::IsReadableStream(body_obj)) {
+    JS::RootedString type_str(cx, Blob::type(body_obj));
+    if (JS::GetStringLength(type_str) > 0) {
+      host_type_str = core::encode(cx, type_str);
+      MOZ_ASSERT(host_type_str);
+      content_type = host_type_str.ptr.get();
+    }
+  } else if (body_obj && JS::IsReadableStream(body_obj)) {
     if (RequestOrResponse::body_unusable(cx, body_obj)) {
       return api::throw_error(cx, FetchErrors::BodyStreamUnusable);
     }
@@ -539,6 +560,15 @@ bool RequestOrResponse::parse_body(JSContext *cx, JS::HandleObject self, JS::Uni
     }
     static_cast<void>(buf.release());
     result.setObject(*array_buffer);
+  } else if constexpr (result_type == RequestOrResponse::BodyReadResult::Blob) {
+    JS::RootedString contentType(cx, JS_GetEmptyString(cx));
+    JS::RootedObject blob(cx, blob::Blob::create(cx, std::move(buf), len, contentType));
+
+    if (!blob) {
+      return RejectPromiseWithPendingError(cx, result_promise);
+    }
+
+    result.setObject(*blob);
   } else {
     JS::RootedString text(cx, JS_NewStringCopyUTF8N(cx, JS::UTF8Chars(buf.get(), len)));
     if (!text) {
@@ -1303,6 +1333,7 @@ const JSPropertySpec Request::static_properties[] = {
 const JSFunctionSpec Request::methods[] = {
     JS_FN("arrayBuffer", Request::bodyAll<RequestOrResponse::BodyReadResult::ArrayBuffer>, 0,
           JSPROP_ENUMERATE),
+    JS_FN("blob", Request::bodyAll<RequestOrResponse::BodyReadResult::Blob>, 0, JSPROP_ENUMERATE),
     JS_FN("json", Request::bodyAll<RequestOrResponse::BodyReadResult::JSON>, 0, JSPROP_ENUMERATE),
     JS_FN("text", Request::bodyAll<RequestOrResponse::BodyReadResult::Text>, 0, JSPROP_ENUMERATE),
     JS_FN("clone", Request::clone, 0, JSPROP_ENUMERATE),
@@ -2294,6 +2325,7 @@ const JSPropertySpec Response::static_properties[] = {
 const JSFunctionSpec Response::methods[] = {
     JS_FN("arrayBuffer", bodyAll<RequestOrResponse::BodyReadResult::ArrayBuffer>, 0,
           JSPROP_ENUMERATE),
+    JS_FN("blob", bodyAll<RequestOrResponse::BodyReadResult::Blob>, 0, JSPROP_ENUMERATE),
     JS_FN("json", bodyAll<RequestOrResponse::BodyReadResult::JSON>, 0, JSPROP_ENUMERATE),
     JS_FN("text", bodyAll<RequestOrResponse::BodyReadResult::Text>, 0, JSPROP_ENUMERATE),
     JS_FS_END,
diff --git a/builtins/web/fetch/request-response.h b/builtins/web/fetch/request-response.h
index b963ca25..0f216f3a 100644
--- a/builtins/web/fetch/request-response.h
+++ b/builtins/web/fetch/request-response.h
@@ -74,6 +74,7 @@ class RequestOrResponse final {
 
   enum class BodyReadResult {
     ArrayBuffer,
+    Blob,
     JSON,
     Text,
   };
diff --git a/builtins/web/structured-clone.cpp b/builtins/web/structured-clone.cpp
index fc6c2c15..e19a54a0 100644
--- a/builtins/web/structured-clone.cpp
+++ b/builtins/web/structured-clone.cpp
@@ -1,6 +1,8 @@
 #include "structured-clone.h"
+#include "blob.h"
 
 #include "dom-exception.h"
+#include "mozilla/Assertions.h"
 
 namespace builtins {
 namespace web {
@@ -8,29 +10,20 @@ namespace structured_clone {
 
 // Magic number used in structured cloning as a tag to identify a
 // URLSearchParam.
-#define SCTAG_DOM_URLSEARCHPARAMS JS_SCTAG_USER_MIN
+#define SCTAG_DOM_URLSEARCHPARAMS (JS_SCTAG_USER_MIN)
+#define SCTAG_DOM_BLOB            (JS_SCTAG_USER_MIN + 1)
 
 /**
  * Reads non-JS builtins during structured cloning.
  *
- * Currently the only relevant builtin is URLSearchParams, but that'll grow to
- * include Blob and FormData, too.
+ * Currently the only relevant builtin is URLSearchParams and Blob, but that'll grow to
+ * include FormData, too.
  *
  * TODO: Add support for CryptoKeys
  */
 JSObject *ReadStructuredClone(JSContext *cx, JSStructuredCloneReader *r,
                               const JS::CloneDataPolicy &cloneDataPolicy, uint32_t tag,
                               uint32_t len, void *closure) {
-  MOZ_ASSERT(tag == SCTAG_DOM_URLSEARCHPARAMS);
-
-  RootedObject urlSearchParamsInstance(cx,
-                                       JS_NewObjectWithGivenProto(cx, &url::URLSearchParams::class_,
-                                                                  url::URLSearchParams::proto_obj));
-  RootedObject params_obj(cx, url::URLSearchParams::create(cx, urlSearchParamsInstance));
-  if (!params_obj) {
-    return nullptr;
-  }
-
   void *bytes = JS_malloc(cx, len);
   if (!bytes) {
     JS_ReportOutOfMemory(cx);
@@ -41,32 +34,62 @@ JSObject *ReadStructuredClone(JSContext *cx, JSStructuredCloneReader *r,
     return nullptr;
   }
 
-  jsurl::SpecString init((uint8_t *)bytes, len, len);
-  jsurl::params_init(url::URLSearchParams::get_params(params_obj), &init);
+  switch (tag) {
+  case SCTAG_DOM_URLSEARCHPARAMS: {
+    RootedObject urlSearchParamsInstance(cx,
+                                         JS_NewObjectWithGivenProto(cx, &url::URLSearchParams::class_,
+                                                                    url::URLSearchParams::proto_obj));
+    RootedObject params_obj(cx, url::URLSearchParams::create(cx, urlSearchParamsInstance));
+    if (!params_obj) {
+      return nullptr;
+    }
+
+    jsurl::SpecString init((uint8_t *)bytes, len, len);
+    jsurl::params_init(url::URLSearchParams::get_params(params_obj), &init);
+
+    return params_obj;
 
-  return params_obj;
+  }
+  case SCTAG_DOM_BLOB: {
+    JS::RootedString contentType(cx, JS_GetEmptyString(cx));
+    UniqueChars chars(reinterpret_cast<char *>(bytes));
+
+    RootedObject blob(cx, blob::Blob::create(cx, std::move(chars), len, contentType));
+    return blob;
+  }
+  default: {
+    MOZ_ASSERT_UNREACHABLE("structured-clone undefined tag");
+    return nullptr;
+  }
+  }
 }
 
 /**
  * Writes non-JS builtins during structured cloning.
  *
- * Currently the only relevant builtin is URLSearchParams, but that'll grow to
- * include Blob and FormData, too.
+ * Currently the only relevant builtin is URLSearchParams and Blob, but that'll grow to
+ * include FormData, too.
  *
  * TODO: Add support for CryptoKeys
  */
 bool WriteStructuredClone(JSContext *cx, JSStructuredCloneWriter *w, JS::HandleObject obj,
                           bool *sameProcessScopeRequired, void *closure) {
-  if (!url::URLSearchParams::is_instance(obj)) {
+  if (url::URLSearchParams::is_instance(obj)) {
+    auto slice = url::URLSearchParams::serialize(cx, obj);
+    if (!JS_WriteUint32Pair(w, SCTAG_DOM_URLSEARCHPARAMS, slice.len) ||
+        !JS_WriteBytes(w, (void *)slice.data, slice.len)) {
+      return false;
+    }
+  } else if (blob::Blob::is_instance(obj)) {
+    auto data = blob::Blob::blob(obj);
+    if (!JS_WriteUint32Pair(w, SCTAG_DOM_BLOB, data->length()) ||
+        !JS_WriteBytes(w, (void *)data->begin(), data->length())) {
+      return false;
+    }
+  } else {
     return dom_exception::DOMException::raise(cx, "The object could not be cloned", "DataCloneError");
   }
 
-  auto slice = url::URLSearchParams::serialize(cx, obj);
-  if (!JS_WriteUint32Pair(w, SCTAG_DOM_URLSEARCHPARAMS, slice.len) ||
-      !JS_WriteBytes(w, (void *)slice.data, slice.len)) {
-    return false;
-  }
-
   return true;
 }
 
diff --git a/tests/wpt-harness/expectations/fetch/api/body/cloned-any.js.json b/tests/wpt-harness/expectations/fetch/api/body/cloned-any.js.json
index 2a5fcc1a..a8a9143d 100644
--- a/tests/wpt-harness/expectations/fetch/api/body/cloned-any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/body/cloned-any.js.json
@@ -12,6 +12,6 @@
     "status": "PASS"
   },
   "Blob is cloned": {
-    "status": "FAIL"
+    "status": "PASS"
   }
 }
\ No newline at end of file
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-consume-empty.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-consume-empty.any.js.json
index f62ab9cb..0539b451 100644
--- a/tests/wpt-harness/expectations/fetch/api/request/request-consume-empty.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-consume-empty.any.js.json
@@ -3,7 +3,7 @@
     "status": "PASS"
   },
   "Consume request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume request's body as arrayBuffer": {
     "status": "PASS"
@@ -21,13 +21,13 @@
     "status": "FAIL"
   },
   "Consume empty blob request body as arrayBuffer": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume empty text request body as arrayBuffer": {
     "status": "PASS"
   },
   "Consume empty blob request body as text": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume empty text request body as text": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-consume.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-consume.any.js.json
index 29eb926e..7b1401b5 100644
--- a/tests/wpt-harness/expectations/fetch/api/request/request-consume.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-consume.any.js.json
@@ -3,7 +3,7 @@
     "status": "PASS"
   },
   "Consume String request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume String request's body as arrayBuffer": {
     "status": "PASS"
@@ -18,7 +18,7 @@
     "status": "PASS"
   },
   "Consume ArrayBuffer request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume ArrayBuffer request's body as arrayBuffer": {
     "status": "PASS"
@@ -33,7 +33,7 @@
     "status": "PASS"
   },
   "Consume Uint8Array request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume Uint8Array request's body as arrayBuffer": {
     "status": "PASS"
@@ -48,7 +48,7 @@
     "status": "PASS"
   },
   "Consume Int8Array request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume Int8Array request's body as arrayBuffer": {
     "status": "PASS"
@@ -63,7 +63,7 @@
     "status": "PASS"
   },
   "Consume Float32Array request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume Float32Array request's body as arrayBuffer": {
     "status": "PASS"
@@ -78,7 +78,7 @@
     "status": "PASS"
   },
   "Consume DataView request's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume DataView request's body as arrayBuffer": {
     "status": "PASS"
@@ -93,22 +93,22 @@
     "status": "FAIL"
   },
   "Consume blob response's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume blob response's body as text": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume blob response's body as json": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume blob response's body as arrayBuffer": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume blob response's body as bytes": {
     "status": "FAIL"
   },
   "Consume blob response's body as blob (empty blob as input)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume JSON from text: '\"null\"'": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-disturbed.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-disturbed.any.js.json
new file mode 100644
index 00000000..d2068740
--- /dev/null
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-disturbed.any.js.json
@@ -0,0 +1,29 @@
+{
+  "Request's body: initial state": {
+    "status": "PASS"
+  },
+  "Request without body cannot be disturbed": {
+    "status": "PASS"
+  },
+  "Check cloning a disturbed request": {
+    "status": "FAIL"
+  },
+  "Check creating a new request from a disturbed request": {
+    "status": "PASS"
+  },
+  "Check creating a new request with a new body from a disturbed request": {
+    "status": "PASS"
+  },
+  "Input request used for creating new request became disturbed": {
+    "status": "FAIL"
+  },
+  "Input request used for creating new request became disturbed even if body is not used": {
+    "status": "FAIL"
+  },
+  "Check consuming a disturbed request": {
+    "status": "PASS"
+  },
+  "Request construction failure should not set \"bodyUsed\"": {
+    "status": "FAIL"
+  }
+}
\ No newline at end of file
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-headers.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-headers.any.js.json
index 98c21422..9aef7b26 100644
--- a/tests/wpt-harness/expectations/fetch/api/request/request-headers.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-headers.any.js.json
@@ -177,7 +177,7 @@
     "status": "PASS"
   },
   "Testing empty Request Content-Type header": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Test that Request.headers has the [SameObject] extended attribute": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-init-contenttype.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-init-contenttype.any.js.json
index 1d538608..180d3949 100644
--- a/tests/wpt-harness/expectations/fetch/api/request/request-init-contenttype.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-init-contenttype.any.js.json
@@ -3,13 +3,13 @@
     "status": "PASS"
   },
   "Default Content-Type for Request with Blob body (no type set)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Request with Blob body (empty type)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Request with Blob body (set type)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Request with buffer source body": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/request/request-structure.any.js.json b/tests/wpt-harness/expectations/fetch/api/request/request-structure.any.js.json
index be010b84..c01e04b2 100644
--- a/tests/wpt-harness/expectations/fetch/api/request/request-structure.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/request/request-structure.any.js.json
@@ -6,7 +6,7 @@
     "status": "PASS"
   },
   "Request has blob method": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Request has formData method": {
     "status": "FAIL"
@@ -71,4 +71,4 @@
   "Request does not expose blocking attribute": {
     "status": "PASS"
   }
-}
+}
\ No newline at end of file
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-consume-empty.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-consume-empty.any.js.json
index 26ee5254..095fa14b 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-consume-empty.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-consume-empty.any.js.json
@@ -3,7 +3,7 @@
     "status": "PASS"
   },
   "Consume response's body as blob": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume response's body as arrayBuffer": {
     "status": "PASS"
@@ -21,13 +21,13 @@
     "status": "FAIL"
   },
   "Consume empty blob response body as arrayBuffer": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume empty text response body as arrayBuffer": {
     "status": "PASS"
   },
   "Consume empty blob response body as text": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Consume empty text response body as text": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-error-from-stream.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-error-from-stream.any.js.json
index 14ffc379..9c67f745 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-error-from-stream.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-error-from-stream.any.js.json
@@ -9,7 +9,7 @@
     "status": "PASS"
   },
   "ReadableStream start() Error propagates to Response.blob() Promise": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "ReadableStream start() Error propagates to Response.bytes() Promise": {
     "status": "FAIL"
@@ -27,7 +27,7 @@
     "status": "PASS"
   },
   "ReadableStream pull() Error propagates to Response.blob() Promise": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "ReadableStream pull() Error propagates to Response.bytes() Promise": {
     "status": "FAIL"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-init-contenttype.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-init-contenttype.any.js.json
index 153dc318..c5436211 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-init-contenttype.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-init-contenttype.any.js.json
@@ -3,13 +3,13 @@
     "status": "PASS"
   },
   "Default Content-Type for Response with Blob body (no type set)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Response with Blob body (empty type)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Response with Blob body (set type)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Default Content-Type for Response with buffer source body": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-stream-bad-chunk.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-stream-bad-chunk.any.js.json
index 78654577..6e4cd277 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-stream-bad-chunk.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-stream-bad-chunk.any.js.json
@@ -3,7 +3,7 @@
     "status": "PASS"
   },
   "ReadableStream with non-Uint8Array chunk passed to Response.blob() causes TypeError": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "ReadableStream with non-Uint8Array chunk passed to Response.bytes() causes TypeError": {
     "status": "FAIL"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-1.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-1.any.js.json
index 3dad7f0b..e3fb83ca 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-1.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-1.any.js.json
@@ -1,6 +1,6 @@
 {
   "Getting blob after getting the Response body - not disturbed, not locked (body source: fetch)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting the Response body - not disturbed, not locked (body source: fetch)": {
     "status": "PASS"
@@ -12,7 +12,7 @@
     "status": "PASS"
   },
   "Getting blob after getting the Response body - not disturbed, not locked (body source: stream)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting the Response body - not disturbed, not locked (body source: stream)": {
     "status": "PASS"
@@ -24,7 +24,7 @@
     "status": "PASS"
   },
   "Getting blob after getting the Response body - not disturbed, not locked (body source: string)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting the Response body - not disturbed, not locked (body source: string)": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-2.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-2.any.js.json
index d81b359d..590e3c31 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-2.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-2.any.js.json
@@ -1,6 +1,6 @@
 {
   "Getting blob after getting a locked Response body (body source: fetch)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting a locked Response body (body source: fetch)": {
     "status": "PASS"
@@ -12,7 +12,7 @@
     "status": "PASS"
   },
   "Getting blob after getting a locked Response body (body source: stream)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting a locked Response body (body source: stream)": {
     "status": "PASS"
@@ -24,7 +24,7 @@
     "status": "PASS"
   },
   "Getting blob after getting a locked Response body (body source: string)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after getting a locked Response body (body source: string)": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-3.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-3.any.js.json
index b306c09e..9e7c0598 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-3.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-3.any.js.json
@@ -1,6 +1,6 @@
 {
   "Getting blob after reading the Response body (body source: fetch)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after reading the Response body (body source: fetch)": {
     "status": "PASS"
@@ -12,7 +12,7 @@
     "status": "PASS"
   },
   "Getting blob after reading the Response body (body source: stream)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after reading the Response body (body source: stream)": {
     "status": "PASS"
@@ -24,7 +24,7 @@
     "status": "PASS"
   },
   "Getting blob after reading the Response body (body source: string)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after reading the Response body (body source: string)": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-4.any.js.json b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-4.any.js.json
index 4b94a293..f0a89799 100644
--- a/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-4.any.js.json
+++ b/tests/wpt-harness/expectations/fetch/api/response/response-stream-disturbed-4.any.js.json
@@ -1,6 +1,6 @@
 {
   "Getting blob after cancelling the Response body (body source: fetch)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after cancelling the Response body (body source: fetch)": {
     "status": "PASS"
@@ -12,7 +12,7 @@
     "status": "PASS"
   },
   "Getting blob after cancelling the Response body (body source: stream)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after cancelling the Response body (body source: stream)": {
     "status": "PASS"
@@ -24,7 +24,7 @@
     "status": "PASS"
   },
   "Getting blob after cancelling the Response body (body source: string)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Getting text after cancelling the Response body (body source: string)": {
     "status": "PASS"
diff --git a/tests/wpt-harness/expectations/html/webappapis/structured-clone/structured-clone.any.js.json b/tests/wpt-harness/expectations/html/webappapis/structured-clone/structured-clone.any.js.json
index f85c26b6..2bf9ca36 100644
--- a/tests/wpt-harness/expectations/html/webappapis/structured-clone/structured-clone.any.js.json
+++ b/tests/wpt-harness/expectations/html/webappapis/structured-clone/structured-clone.any.js.json
@@ -246,37 +246,37 @@
     "status": "FAIL"
   },
   "Blob unpaired high surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Blob unpaired low surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Blob paired surrogates (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Blob empty": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Blob NUL": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, Blob basic": {
     "status": "FAIL"
   },
   "Array Blob object, Blob unpaired high surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, Blob unpaired low surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, Blob paired surrogates (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, Blob empty": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, Blob NUL": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Array Blob object, two Blobs": {
     "status": "FAIL"
@@ -285,19 +285,19 @@
     "status": "FAIL"
   },
   "Object Blob object, Blob unpaired high surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Object Blob object, Blob unpaired low surrogate (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Object Blob object, Blob paired surrogates (invalid utf-8)": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Object Blob object, Blob empty": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "Object Blob object, Blob NUL": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "File basic": {
     "status": "FAIL"
@@ -345,7 +345,7 @@
     "status": "PASS"
   },
   "An object whose interface is deleted from the global must still deserialize": {
-    "status": "FAIL"
+    "status": "PASS"
   },
   "A subclass instance will deserialize as its closest serializable superclass": {
     "status": "FAIL"