diff --git a/test/fixtures/wpt/streams/WEB_FEATURES.yml b/test/fixtures/wpt/streams/WEB_FEATURES.yml
index d10bbe4a7d70..54ea2128f328 100644
--- a/test/fixtures/wpt/streams/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/WEB_FEATURES.yml
@@ -1,5 +1,3 @@
-features:
-- name: streams
-  files:
-    # Top-level only. Subdirectories have their own mapping.
-    - "*"
+rules:
+# Top-level only. Subdirectories have their own mapping.
+- "*": [streams]
diff --git a/test/fixtures/wpt/streams/idlharness.any.js b/test/fixtures/wpt/streams/idlharness.any.js
index 0be03b2078f9..42a17da58c5a 100644
--- a/test/fixtures/wpt/streams/idlharness.any.js
+++ b/test/fixtures/wpt/streams/idlharness.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm-in-window
+// META: global=window,worker
 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
 // META: timeout=long
diff --git a/test/fixtures/wpt/streams/piping/WEB_FEATURES.yml b/test/fixtures/wpt/streams/piping/WEB_FEATURES.yml
index 8cf3517baf08..0f17f6b6b657 100644
--- a/test/fixtures/wpt/streams/piping/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/piping/WEB_FEATURES.yml
@@ -1,3 +1,2 @@
-features:
-- name: streams
-  files: "**"
+rules:
+- "**": [streams]
diff --git a/test/fixtures/wpt/streams/piping/abort.any.js b/test/fixtures/wpt/streams/piping/abort.any.js
index e813b017769c..f2e5429492e7 100644
--- a/test/fixtures/wpt/streams/piping/abort.any.js
+++ b/test/fixtures/wpt/streams/piping/abort.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/close-propagation-backward.any.js b/test/fixtures/wpt/streams/piping/close-propagation-backward.any.js
index 25bd475ed13e..5ea47ab85c0c 100644
--- a/test/fixtures/wpt/streams/piping/close-propagation-backward.any.js
+++ b/test/fixtures/wpt/streams/piping/close-propagation-backward.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/piping/close-propagation-forward.any.js b/test/fixtures/wpt/streams/piping/close-propagation-forward.any.js
index 0ec94f80abf0..71b6e2628400 100644
--- a/test/fixtures/wpt/streams/piping/close-propagation-forward.any.js
+++ b/test/fixtures/wpt/streams/piping/close-propagation-forward.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/error-propagation-backward.any.js b/test/fixtures/wpt/streams/piping/error-propagation-backward.any.js
index f786469d6c1d..ec74592f86ef 100644
--- a/test/fixtures/wpt/streams/piping/error-propagation-backward.any.js
+++ b/test/fixtures/wpt/streams/piping/error-propagation-backward.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/error-propagation-forward.any.js b/test/fixtures/wpt/streams/piping/error-propagation-forward.any.js
index e9260f9ea22c..482da2f8a88e 100644
--- a/test/fixtures/wpt/streams/piping/error-propagation-forward.any.js
+++ b/test/fixtures/wpt/streams/piping/error-propagation-forward.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/flow-control.any.js b/test/fixtures/wpt/streams/piping/flow-control.any.js
index e2318da375ab..09c4420f872a 100644
--- a/test/fixtures/wpt/streams/piping/flow-control.any.js
+++ b/test/fixtures/wpt/streams/piping/flow-control.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 // META: script=../resources/recording-streams.js
diff --git a/test/fixtures/wpt/streams/piping/general-addition.any.js b/test/fixtures/wpt/streams/piping/general-addition.any.js
index cf4aa9bea6a1..2562b7064338 100644
--- a/test/fixtures/wpt/streams/piping/general-addition.any.js
+++ b/test/fixtures/wpt/streams/piping/general-addition.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 promise_test(async t => {
diff --git a/test/fixtures/wpt/streams/piping/general.any.js b/test/fixtures/wpt/streams/piping/general.any.js
index f051d8102c2b..272b25a28e80 100644
--- a/test/fixtures/wpt/streams/piping/general.any.js
+++ b/test/fixtures/wpt/streams/piping/general.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/piping/multiple-propagation.any.js b/test/fixtures/wpt/streams/piping/multiple-propagation.any.js
index 9be828a23269..a78652fc0679 100644
--- a/test/fixtures/wpt/streams/piping/multiple-propagation.any.js
+++ b/test/fixtures/wpt/streams/piping/multiple-propagation.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/pipe-through.any.js b/test/fixtures/wpt/streams/piping/pipe-through.any.js
index 339cee199933..26b1cd26a3c8 100644
--- a/test/fixtures/wpt/streams/piping/pipe-through.any.js
+++ b/test/fixtures/wpt/streams/piping/pipe-through.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
diff --git a/test/fixtures/wpt/streams/piping/then-interception.any.js b/test/fixtures/wpt/streams/piping/then-interception.any.js
index fc48c3683114..543f916d940d 100644
--- a/test/fixtures/wpt/streams/piping/then-interception.any.js
+++ b/test/fixtures/wpt/streams/piping/then-interception.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/piping/throwing-options.any.js b/test/fixtures/wpt/streams/piping/throwing-options.any.js
index 186f8ded1968..b9f906778f63 100644
--- a/test/fixtures/wpt/streams/piping/throwing-options.any.js
+++ b/test/fixtures/wpt/streams/piping/throwing-options.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 class ThrowingOptions {
diff --git a/test/fixtures/wpt/streams/piping/transform-streams.any.js b/test/fixtures/wpt/streams/piping/transform-streams.any.js
index e079bb637cad..caae9fbad884 100644
--- a/test/fixtures/wpt/streams/piping/transform-streams.any.js
+++ b/test/fixtures/wpt/streams/piping/transform-streams.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 promise_test(() => {
diff --git a/test/fixtures/wpt/streams/queuing-strategies.any.js b/test/fixtures/wpt/streams/queuing-strategies.any.js
index 9efc4570cf2e..fa959ebba283 100644
--- a/test/fixtures/wpt/streams/queuing-strategies.any.js
+++ b/test/fixtures/wpt/streams/queuing-strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const highWaterMarkConversions = new Map([
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/WEB_FEATURES.yml b/test/fixtures/wpt/streams/readable-byte-streams/WEB_FEATURES.yml
index a35508fc0dc6..e45d3ee347b3 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/readable-byte-streams/WEB_FEATURES.yml
@@ -1,3 +1,2 @@
-features:
-- name: readable-byte-streams
-  files: "**"
+rules:
+- "**": [readable-byte-streams]
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/bad-buffers-and-views.any.js b/test/fixtures/wpt/streams/readable-byte-streams/bad-buffers-and-views.any.js
index eae8dde03f6b..0f018d6d7819 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/bad-buffers-and-views.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/bad-buffers-and-views.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 promise_test(() => {
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/construct-byob-request.any.js b/test/fixtures/wpt/streams/readable-byte-streams/construct-byob-request.any.js
index a26f949ee29d..8d460a1c81b7 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/construct-byob-request.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/construct-byob-request.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/enqueue-with-detached-buffer.any.js b/test/fixtures/wpt/streams/readable-byte-streams/enqueue-with-detached-buffer.any.js
index 92bd0a26a0ec..d2b37f00a9d6 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/enqueue-with-detached-buffer.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/enqueue-with-detached-buffer.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 
 promise_test(async t => {
   const error = new Error('cannot proceed');
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/general.any.js b/test/fixtures/wpt/streams/readable-byte-streams/general.any.js
index 50f4f019ff22..6787ce1b474b 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/general.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/general.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/non-transferable-buffers.any.js b/test/fixtures/wpt/streams/readable-byte-streams/non-transferable-buffers.any.js
index 4bddaef5d647..a70bb6cb23c7 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/non-transferable-buffers.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/non-transferable-buffers.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 promise_test(async t => {
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/patched-global.any.js b/test/fixtures/wpt/streams/readable-byte-streams/patched-global.any.js
index ce2e9e9993ae..39aa40e591ec 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/patched-global.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/patched-global.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/read-min.any.js b/test/fixtures/wpt/streams/readable-byte-streams/read-min.any.js
index 4010e3750ce2..a5d6ad944be5 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/read-min.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/read-min.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/respond-after-enqueue.any.js b/test/fixtures/wpt/streams/readable-byte-streams/respond-after-enqueue.any.js
index e51efa061a65..b93cec97391e 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/respond-after-enqueue.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/respond-after-enqueue.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/tee.any.js b/test/fixtures/wpt/streams/readable-byte-streams/tee.any.js
index 60d82b9cf6a1..2ae7e35fcb6a 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/tee.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/tee.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
@@ -351,6 +351,39 @@ promise_test(async () => {
 
 }, 'ReadableStream teeing with byte source: canceling branch1 should finish when branch2 reads until end of stream');
 
+promise_test(async () => {
+
+  let controller;
+  const rs = new ReadableStream({
+    type: 'bytes',
+    start(c) {
+      controller = c;
+    }
+  });
+
+  const [branch1, branch2] = rs.tee();
+  const reader1 = branch1.getReader({ mode: 'byob' });
+  const reader2 = branch2.getReader({ mode: 'byob' });
+  const cancelPromise = reader1.cancel();
+
+  controller.enqueue(new Uint8Array([0x01]));
+
+  const read2 = await reader2.read(new Uint8Array(1));
+  assert_equals(read2.done, false, 'first read() from branch2 should not be done');
+  assert_typed_array_equals(read2.value, new Uint8Array([0x01]), 'first read() from branch2');
+
+  controller.close();
+
+  const read2b = await reader2.read(new Uint8Array(1));
+  assert_equals(read2b.done, true, 'second read() from branch2 should be done');
+
+  await Promise.all([
+    reader2.closed,
+    cancelPromise
+  ]);
+
+}, 'ReadableStream teeing with byte source: canceling branch1 should finish when branch2 reads with a BYOB reader until end of stream');
+
 promise_test(async t => {
 
   let controller;
diff --git a/test/fixtures/wpt/streams/readable-byte-streams/templated.any.js b/test/fixtures/wpt/streams/readable-byte-streams/templated.any.js
index e4c10f768596..8438db50e9e6 100644
--- a/test/fixtures/wpt/streams/readable-byte-streams/templated.any.js
+++ b/test/fixtures/wpt/streams/readable-byte-streams/templated.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-test-templates.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/WEB_FEATURES.yml b/test/fixtures/wpt/streams/readable-streams/WEB_FEATURES.yml
index ad2cb549631f..46a402b60b27 100644
--- a/test/fixtures/wpt/streams/readable-streams/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/readable-streams/WEB_FEATURES.yml
@@ -1,14 +1,6 @@
-features:
-- name: streams
-  files:
-    - "*"
-    - "!async-iterator.any.js"
-    - "!from.any.js"
-    # 'owning' type is not yet standardized
-    - "!owning-type*"
-- name: async-iterable-streams
-  files:
-    - async-iterator.any.js
-- name: readablestream-from
-  files:
-    - from.any.js
+rules:
+- async-iterator.any.js: [async-iterable-streams]
+- from.any.js: [readablestream-from]
+# 'owning' type is not yet standardized
+- owning-type*: []
+- "*": [streams]
diff --git a/test/fixtures/wpt/streams/readable-streams/async-iterator.any.js b/test/fixtures/wpt/streams/readable-streams/async-iterator.any.js
index e192201b531d..d815e9d1a16b 100644
--- a/test/fixtures/wpt/streams/readable-streams/async-iterator.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/async-iterator.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
diff --git a/test/fixtures/wpt/streams/readable-streams/bad-strategies.any.js b/test/fixtures/wpt/streams/readable-streams/bad-strategies.any.js
index 49fa4bdbece5..409c63b8177e 100644
--- a/test/fixtures/wpt/streams/readable-streams/bad-strategies.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/bad-strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 test(() => {
diff --git a/test/fixtures/wpt/streams/readable-streams/bad-underlying-sources.any.js b/test/fixtures/wpt/streams/readable-streams/bad-underlying-sources.any.js
index 3d77b923d178..e9cf4c924930 100644
--- a/test/fixtures/wpt/streams/readable-streams/bad-underlying-sources.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/bad-underlying-sources.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 
diff --git a/test/fixtures/wpt/streams/readable-streams/cancel.any.js b/test/fixtures/wpt/streams/readable-streams/cancel.any.js
index d44222f1497f..8e186be586c1 100644
--- a/test/fixtures/wpt/streams/readable-streams/cancel.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/cancel.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/constructor.any.js b/test/fixtures/wpt/streams/readable-streams/constructor.any.js
index 0b995f0cb16b..608dc48cfa39 100644
--- a/test/fixtures/wpt/streams/readable-streams/constructor.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/constructor.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const error1 = new Error('error1');
diff --git a/test/fixtures/wpt/streams/readable-streams/count-queuing-strategy-integration.any.js b/test/fixtures/wpt/streams/readable-streams/count-queuing-strategy-integration.any.js
index a8c1b91d0068..02ac5bae5c2f 100644
--- a/test/fixtures/wpt/streams/readable-streams/count-queuing-strategy-integration.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/count-queuing-strategy-integration.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 test(() => {
diff --git a/test/fixtures/wpt/streams/readable-streams/crashtests/WEB_FEATURES.yml b/test/fixtures/wpt/streams/readable-streams/crashtests/WEB_FEATURES.yml
index f4eaacc3edb4..fb282ca004eb 100644
--- a/test/fixtures/wpt/streams/readable-streams/crashtests/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/readable-streams/crashtests/WEB_FEATURES.yml
@@ -1,7 +1,3 @@
-features:
-- name: streams
-  files:
-    - strategy-worker-terminate.html
-- name: readablestream-from
-  files:
-    - from-cross-realm.https.html
+rules:
+- strategy-worker-terminate.html: [streams]
+- from-cross-realm.https.html: [readablestream-from]
diff --git a/test/fixtures/wpt/streams/readable-streams/default-reader.any.js b/test/fixtures/wpt/streams/readable-streams/default-reader.any.js
index f92862719e47..59d7ab2f74db 100644
--- a/test/fixtures/wpt/streams/readable-streams/default-reader.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/default-reader.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/readable-streams/floating-point-total-queue-size.any.js b/test/fixtures/wpt/streams/readable-streams/floating-point-total-queue-size.any.js
index 8b88c21d7f0b..50cca3d951a9 100644
--- a/test/fixtures/wpt/streams/readable-streams/floating-point-total-queue-size.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/floating-point-total-queue-size.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 // Due to the limitations of floating-point precision, the calculation of desiredSize sometimes gives different answers
diff --git a/test/fixtures/wpt/streams/readable-streams/from.any.js b/test/fixtures/wpt/streams/readable-streams/from.any.js
index 2b28a05fee39..d8144c5f4c8a 100644
--- a/test/fixtures/wpt/streams/readable-streams/from.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/from.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 'use strict';
 
@@ -18,11 +18,6 @@ const iterableFactories = [
     return ['a', 'b'][Symbol.iterator]();
   }],
 
-  ['a string', () => {
-    // This iterates over the code points of the string.
-    return 'ab';
-  }],
-
   ['a Set', () => {
     return new Set(['a', 'b']);
   }],
@@ -81,6 +76,19 @@ const iterableFactories = [
     return iterable;
   }],
 
+  ['a sync iterable with a function iterator', () => {
+    const chunks = ['a', 'b'];
+    function functionIterator() {}
+    functionIterator.next = () => ({
+      done: chunks.length === 0,
+      value: chunks.shift()
+    });
+    const iterable = {
+      [Symbol.iterator]: () => functionIterator
+    };
+    return iterable;
+  }],
+
   ['an async iterable', () => {
     const chunks = ['a', 'b'];
     const asyncIterator = {
@@ -97,6 +105,19 @@ const iterableFactories = [
     return asyncIterable;
   }],
 
+  ['an async iterable with a function iterator', () => {
+    const chunks = ['a', 'b'];
+    function functionAsyncIterator() {}
+    functionAsyncIterator.next = () => Promise.resolve({
+      done: chunks.length === 0,
+      value: chunks.shift()
+    });
+    const asyncIterable = {
+      [Symbol.asyncIterator]: () => functionAsyncIterator
+    };
+    return asyncIterable;
+  }],
+
   ['a ReadableStream', () => {
     return new ReadableStream({
       start(c) {
@@ -144,6 +165,7 @@ const badIterables = [
   ['Object.create(null)', Object.create(null)],
   ['a function', () => 42],
   ['a symbol', Symbol()],
+  ['a string', 'ab'],
   ['an object with a non-callable @@iterator method', {
     [Symbol.iterator]: 42
   }],
diff --git a/test/fixtures/wpt/streams/readable-streams/garbage-collection.any.js b/test/fixtures/wpt/streams/readable-streams/garbage-collection.any.js
index abcb4cf21b89..907eb6006822 100644
--- a/test/fixtures/wpt/streams/readable-streams/garbage-collection.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/garbage-collection.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=/common/gc.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/general.any.js b/test/fixtures/wpt/streams/readable-streams/general.any.js
index eee3f62215ee..2a32b27943c8 100644
--- a/test/fixtures/wpt/streams/readable-streams/general.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/general.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/owning-type-message-port.any.js b/test/fixtures/wpt/streams/readable-streams/owning-type-message-port.tentative.any.js
similarity index 97%
rename from test/fixtures/wpt/streams/readable-streams/owning-type-message-port.any.js
rename to test/fixtures/wpt/streams/readable-streams/owning-type-message-port.tentative.any.js
index 282c1f411485..e9961ce04225 100644
--- a/test/fixtures/wpt/streams/readable-streams/owning-type-message-port.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/owning-type-message-port.tentative.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/owning-type-video-frame.any.js b/test/fixtures/wpt/streams/readable-streams/owning-type-video-frame.tentative.any.js
similarity index 100%
rename from test/fixtures/wpt/streams/readable-streams/owning-type-video-frame.any.js
rename to test/fixtures/wpt/streams/readable-streams/owning-type-video-frame.tentative.any.js
diff --git a/test/fixtures/wpt/streams/readable-streams/owning-type.any.js b/test/fixtures/wpt/streams/readable-streams/owning-type.tentative.any.js
similarity index 98%
rename from test/fixtures/wpt/streams/readable-streams/owning-type.any.js
rename to test/fixtures/wpt/streams/readable-streams/owning-type.tentative.any.js
index 34c2a55d5134..27a3dda894e4 100644
--- a/test/fixtures/wpt/streams/readable-streams/owning-type.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/owning-type.tentative.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/readable-streams/patched-global.any.js b/test/fixtures/wpt/streams/readable-streams/patched-global.any.js
index c208824c8644..a64a054a97f1 100644
--- a/test/fixtures/wpt/streams/readable-streams/patched-global.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/patched-global.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 // Tests which patch the global environment are kept separate to avoid
diff --git a/test/fixtures/wpt/streams/readable-streams/reentrant-strategies.any.js b/test/fixtures/wpt/streams/readable-streams/reentrant-strategies.any.js
index 8ae7b98e8d5e..b4988bc2433f 100644
--- a/test/fixtures/wpt/streams/readable-streams/reentrant-strategies.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/reentrant-strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
diff --git a/test/fixtures/wpt/streams/readable-streams/tee.any.js b/test/fixtures/wpt/streams/readable-streams/tee.any.js
index c2c2e4823072..00397932f4b6 100644
--- a/test/fixtures/wpt/streams/readable-streams/tee.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/tee.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
diff --git a/test/fixtures/wpt/streams/readable-streams/templated.any.js b/test/fixtures/wpt/streams/readable-streams/templated.any.js
index 4f2440c0880b..8fdb0176ceff 100644
--- a/test/fixtures/wpt/streams/readable-streams/templated.any.js
+++ b/test/fixtures/wpt/streams/readable-streams/templated.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-test-templates.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/transferable/WEB_FEATURES.yml b/test/fixtures/wpt/streams/transferable/WEB_FEATURES.yml
index 4ecacf5edbc7..a21859368559 100644
--- a/test/fixtures/wpt/streams/transferable/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/transferable/WEB_FEATURES.yml
@@ -1,3 +1,2 @@
-features:
-- name: transferable-streams
-  files: "**"
+rules:
+- "**": [transferable-streams]
diff --git a/test/fixtures/wpt/streams/transferable/transform-stream-members.any.js b/test/fixtures/wpt/streams/transferable/transform-stream-members.any.js
index 05914e12ccbe..3679eb7b140a 100644
--- a/test/fixtures/wpt/streams/transferable/transform-stream-members.any.js
+++ b/test/fixtures/wpt/streams/transferable/transform-stream-members.any.js
@@ -1,4 +1,4 @@
-// META: global=window,dedicatedworker,shadowrealm
+// META: global=window,dedicatedworker
 
 const combinations = [
   (t => [t, t.readable])(new TransformStream()),
diff --git a/test/fixtures/wpt/streams/transform-streams/WEB_FEATURES.yml b/test/fixtures/wpt/streams/transform-streams/WEB_FEATURES.yml
index f39dc16de4c7..197d23a07ffa 100644
--- a/test/fixtures/wpt/streams/transform-streams/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/transform-streams/WEB_FEATURES.yml
@@ -1,8 +1,3 @@
-features:
-- name: streams
-  files:
-    - "*"
-    - "!cancel.any.js"
-- name: transformstream-transformer-cancel
-  files:
-    - cancel.any.js
+rules:
+- cancel.any.js: [transformstream-transformer-cancel]
+- "*": [streams]
diff --git a/test/fixtures/wpt/streams/transform-streams/backpressure.any.js b/test/fixtures/wpt/streams/transform-streams/backpressure.any.js
index 47a21fb7e71f..6befba41b795 100644
--- a/test/fixtures/wpt/streams/transform-streams/backpressure.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/backpressure.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/transform-streams/cancel.any.js b/test/fixtures/wpt/streams/transform-streams/cancel.any.js
index 9b369bfb7c68..fc5ef9570404 100644
--- a/test/fixtures/wpt/streams/transform-streams/cancel.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/cancel.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/transform-streams/errors.any.js b/test/fixtures/wpt/streams/transform-streams/errors.any.js
index bea060b65908..7efe894f4887 100644
--- a/test/fixtures/wpt/streams/transform-streams/errors.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/errors.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/transform-streams/flush.any.js b/test/fixtures/wpt/streams/transform-streams/flush.any.js
index c95d8ae11865..487de1c93b0f 100644
--- a/test/fixtures/wpt/streams/transform-streams/flush.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/flush.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/transform-streams/general.any.js b/test/fixtures/wpt/streams/transform-streams/general.any.js
index a40ef30843ec..dff2e7e8a70d 100644
--- a/test/fixtures/wpt/streams/transform-streams/general.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/general.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/rs-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/transform-streams/lipfuzz.any.js b/test/fixtures/wpt/streams/transform-streams/lipfuzz.any.js
index e334705db443..f9f148aaf1c6 100644
--- a/test/fixtures/wpt/streams/transform-streams/lipfuzz.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/lipfuzz.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 class LipFuzzTransformer {
diff --git a/test/fixtures/wpt/streams/transform-streams/patched-global.any.js b/test/fixtures/wpt/streams/transform-streams/patched-global.any.js
index cc111eda452f..2d04e3b948b3 100644
--- a/test/fixtures/wpt/streams/transform-streams/patched-global.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/patched-global.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 // Tests which patch the global environment are kept separate to avoid
diff --git a/test/fixtures/wpt/streams/transform-streams/properties.any.js b/test/fixtures/wpt/streams/transform-streams/properties.any.js
index dbfd1aa372b9..02981b8bc76a 100644
--- a/test/fixtures/wpt/streams/transform-streams/properties.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/properties.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const transformerMethods = {
diff --git a/test/fixtures/wpt/streams/transform-streams/reentrant-strategies.any.js b/test/fixtures/wpt/streams/transform-streams/reentrant-strategies.any.js
index a6d459655856..306cce8fc8b7 100644
--- a/test/fixtures/wpt/streams/transform-streams/reentrant-strategies.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/reentrant-strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/rs-utils.js
 // META: script=../resources/test-utils.js
diff --git a/test/fixtures/wpt/streams/transform-streams/strategies.any.js b/test/fixtures/wpt/streams/transform-streams/strategies.any.js
index 57e113e668ce..94055ad99dc9 100644
--- a/test/fixtures/wpt/streams/transform-streams/strategies.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/transform-streams/terminate.any.js b/test/fixtures/wpt/streams/transform-streams/terminate.any.js
index a959e70fe693..670006366db2 100644
--- a/test/fixtures/wpt/streams/transform-streams/terminate.any.js
+++ b/test/fixtures/wpt/streams/transform-streams/terminate.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/recording-streams.js
 // META: script=../resources/test-utils.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/WEB_FEATURES.yml b/test/fixtures/wpt/streams/writable-streams/WEB_FEATURES.yml
index 8cf3517baf08..0f17f6b6b657 100644
--- a/test/fixtures/wpt/streams/writable-streams/WEB_FEATURES.yml
+++ b/test/fixtures/wpt/streams/writable-streams/WEB_FEATURES.yml
@@ -1,3 +1,2 @@
-features:
-- name: streams
-  files: "**"
+rules:
+- "**": [streams]
diff --git a/test/fixtures/wpt/streams/writable-streams/aborting.any.js b/test/fixtures/wpt/streams/writable-streams/aborting.any.js
index 9d8e80b1de63..58362b766901 100644
--- a/test/fixtures/wpt/streams/writable-streams/aborting.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/aborting.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/bad-strategies.any.js b/test/fixtures/wpt/streams/writable-streams/bad-strategies.any.js
index a1ef0791168f..63fa443065ee 100644
--- a/test/fixtures/wpt/streams/writable-streams/bad-strategies.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/bad-strategies.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const error1 = new Error('a unique string');
diff --git a/test/fixtures/wpt/streams/writable-streams/bad-underlying-sinks.any.js b/test/fixtures/wpt/streams/writable-streams/bad-underlying-sinks.any.js
index 3c434ffe60cc..d0b3467978ea 100644
--- a/test/fixtures/wpt/streams/writable-streams/bad-underlying-sinks.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/bad-underlying-sinks.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/byte-length-queuing-strategy.any.js b/test/fixtures/wpt/streams/writable-streams/byte-length-queuing-strategy.any.js
index eed86ee7004e..ce1962e8917f 100644
--- a/test/fixtures/wpt/streams/writable-streams/byte-length-queuing-strategy.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/byte-length-queuing-strategy.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 promise_test(t => {
diff --git a/test/fixtures/wpt/streams/writable-streams/close.any.js b/test/fixtures/wpt/streams/writable-streams/close.any.js
index 3b2c07cc3bfe..9c1bc93b011d 100644
--- a/test/fixtures/wpt/streams/writable-streams/close.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/close.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/constructor.any.js b/test/fixtures/wpt/streams/writable-streams/constructor.any.js
index bb382a33b8e0..ba54e39cdbc5 100644
--- a/test/fixtures/wpt/streams/writable-streams/constructor.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/constructor.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const error1 = new Error('error1');
diff --git a/test/fixtures/wpt/streams/writable-streams/count-queuing-strategy.any.js b/test/fixtures/wpt/streams/writable-streams/count-queuing-strategy.any.js
index 8211757530d3..064e16e81506 100644
--- a/test/fixtures/wpt/streams/writable-streams/count-queuing-strategy.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/count-queuing-strategy.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 test(() => {
diff --git a/test/fixtures/wpt/streams/writable-streams/error.any.js b/test/fixtures/wpt/streams/writable-streams/error.any.js
index d08c8a54863b..faf3fdd95214 100644
--- a/test/fixtures/wpt/streams/writable-streams/error.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/error.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const error1 = new Error('error1');
diff --git a/test/fixtures/wpt/streams/writable-streams/floating-point-total-queue-size.any.js b/test/fixtures/wpt/streams/writable-streams/floating-point-total-queue-size.any.js
index 20a14fc19a51..bd34cc53a695 100644
--- a/test/fixtures/wpt/streams/writable-streams/floating-point-total-queue-size.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/floating-point-total-queue-size.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 // Due to the limitations of floating-point precision, the calculation of desiredSize sometimes gives different answers
diff --git a/test/fixtures/wpt/streams/writable-streams/garbage-collection.any.js b/test/fixtures/wpt/streams/writable-streams/garbage-collection.any.js
index 5e39e7c60d2c..a5d935c9aa00 100644
--- a/test/fixtures/wpt/streams/writable-streams/garbage-collection.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/garbage-collection.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=/common/gc.js
 'use strict';
 
diff --git a/test/fixtures/wpt/streams/writable-streams/general.any.js b/test/fixtures/wpt/streams/writable-streams/general.any.js
index 48f8eeb89e41..cede7fd0845b 100644
--- a/test/fixtures/wpt/streams/writable-streams/general.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/general.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 test(() => {
diff --git a/test/fixtures/wpt/streams/writable-streams/properties.any.js b/test/fixtures/wpt/streams/writable-streams/properties.any.js
index ae0549f0871b..c95bd7d0c080 100644
--- a/test/fixtures/wpt/streams/writable-streams/properties.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/properties.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 'use strict';
 
 const sinkMethods = {
diff --git a/test/fixtures/wpt/streams/writable-streams/reentrant-strategy.any.js b/test/fixtures/wpt/streams/writable-streams/reentrant-strategy.any.js
index 18ce9e84759a..eb05cc068043 100644
--- a/test/fixtures/wpt/streams/writable-streams/reentrant-strategy.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/reentrant-strategy.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/start.any.js b/test/fixtures/wpt/streams/writable-streams/start.any.js
index 17972b568ceb..82d869430dd7 100644
--- a/test/fixtures/wpt/streams/writable-streams/start.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/start.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/streams/writable-streams/write.any.js b/test/fixtures/wpt/streams/writable-streams/write.any.js
index 20a2885bf351..f0246f6cad39 100644
--- a/test/fixtures/wpt/streams/writable-streams/write.any.js
+++ b/test/fixtures/wpt/streams/writable-streams/write.any.js
@@ -1,4 +1,4 @@
-// META: global=window,worker,shadowrealm
+// META: global=window,worker
 // META: script=../resources/test-utils.js
 // META: script=../resources/recording-streams.js
 'use strict';
diff --git a/test/fixtures/wpt/versions.json b/test/fixtures/wpt/versions.json
index 6cc8b0749862..e4d65aeba685 100644
--- a/test/fixtures/wpt/versions.json
+++ b/test/fixtures/wpt/versions.json
@@ -72,7 +72,7 @@
     "path": "service-workers"
   },
   "streams": {
-    "commit": "f8f26a372f357370846226ff64db1f9cc98a1edb",
+    "commit": "4832db47614f5f48cc57374cbf5c1f70937fad48",
     "path": "streams"
   },
   "url": {
diff --git a/test/wpt/status/streams.json b/test/wpt/status/streams.json
index 968b33597651..5be444999b00 100644
--- a/test/wpt/status/streams.json
+++ b/test/wpt/status/streams.json
@@ -8,7 +8,14 @@
   "readable-streams/cross-realm-crash.window.js": {
     "skip": "Browser-specific test"
   },
-  "readable-streams/owning-type-message-port.any.js": {
+  "readable-streams/from.any.js": {
+    "fail": {
+      "expected": [
+        "ReadableStream.from throws on invalid iterables; specifically a string"
+      ]
+    }
+  },
+  "readable-streams/owning-type-message-port.tentative.any.js": {
     "fail": {
       "note": "Readable streams with type owning are not yet supported",
       "expected": [
@@ -17,10 +24,10 @@
       ]
     }
   },
-  "readable-streams/owning-type-video-frame.any.js": {
+  "readable-streams/owning-type-video-frame.tentative.any.js": {
     "skip": "Browser-specific test"
   },
-  "readable-streams/owning-type.any.js": {
+  "readable-streams/owning-type.tentative.any.js": {
     "fail": {
       "note": "Readable streams with type owning are not yet supported",
       "expected": [