diff --git a/testing/web-platform/tests/css/css-properties-values-api/register-property-syntax-parsing.html b/testing/web-platform/tests/css/css-properties-values-api/register-property-syntax-parsing.html
index fe7e54a7b1b5f..bc929241d6dce 100644
--- a/testing/web-platform/tests/css/css-properties-values-api/register-property-syntax-parsing.html
+++ b/testing/web-platform/tests/css/css-properties-values-api/register-property-syntax-parsing.html
@@ -251,12 +251,11 @@
 +
 )
 ;
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
diff --git a/testing/web-platform/tests/css/css-properties-values-api/register-property.html b/testing/web-platform/tests/css/css-properties-values-api/register-property.html
index 21034682571ad..e452789990d4d 100644
--- a/testing/web-platform/tests/css/css-properties-values-api/register-property.html
+++ b/testing/web-platform/tests/css/css-properties-values-api/register-property.html
@@ -124,14 +124,11 @@
 (
 )
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -141,14 +138,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -159,14 +153,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -177,14 +168,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -195,14 +183,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -215,14 +200,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -324,14 +306,11 @@
 Invalid
 property
 names
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -343,12 +322,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -374,12 +352,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -400,12 +377,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -508,12 +484,11 @@
 }
 )
 ;
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -733,14 +708,11 @@
 }
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
diff --git a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssMathValue.tentative.html b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssMathValue.tentative.html
index c5070c8659676..1ec904a0583c5 100644
--- a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssMathValue.tentative.html
+++ b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssMathValue.tentative.html
@@ -187,12 +187,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -399,14 +398,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 result
@@ -578,14 +574,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 result
diff --git a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/parse.tentative.html b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/parse.tentative.html
index 20e812809fc9e..30b9840e23815 100644
--- a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/parse.tentative.html
+++ b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/parse.tentative.html
@@ -128,12 +128,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -168,12 +167,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -210,12 +208,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -253,12 +250,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
diff --git a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/to.tentative.html b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/to.tentative.html
index 0bb776a13d63e..f768ff324301f 100644
--- a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/to.tentative.html
+++ b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/to.tentative.html
@@ -128,12 +128,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -174,14 +173,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -225,14 +221,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -285,14 +278,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -716,14 +706,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -751,14 +738,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -862,14 +846,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -897,14 +878,11 @@
 )
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
diff --git a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/toSum.tentative.html b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/toSum.tentative.html
index 037b15e4858ae..755e4ef6d3955 100644
--- a/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/toSum.tentative.html
+++ b/testing/web-platform/tests/css/css-typed-om/stylevalue-subclasses/numeric-objects/toSum.tentative.html
@@ -128,12 +128,11 @@
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -179,14 +178,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -234,14 +230,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -292,14 +285,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -341,14 +331,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 CSS
@@ -395,14 +382,11 @@
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
diff --git a/testing/web-platform/tests/kv-storage/interface.https.html b/testing/web-platform/tests/kv-storage/interface.https.html
index 139a8bf0de894..3d8288b1101d5 100644
--- a/testing/web-platform/tests/kv-storage/interface.https.html
+++ b/testing/web-platform/tests/kv-storage/interface.https.html
@@ -705,14 +705,11 @@
 name
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 descriptor
@@ -738,14 +735,11 @@
 directly
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 descriptor
@@ -1244,14 +1238,20 @@
 .
 StorageArea
 ;
+const
+TypeError
+=
+iframe
+.
+contentWindow
+.
+TypeError
+;
 await
-promise_rejects
+promise_rejects_js
 (
 t
-new
 TypeError
-(
-)
 OtherStorageArea
 .
 prototype
@@ -1279,13 +1279,10 @@
 )
 ;
 await
-promise_rejects
+promise_rejects_js
 (
 t
-new
 TypeError
-(
-)
 OtherStorageArea
 .
 prototype
@@ -1310,13 +1307,10 @@
 )
 ;
 await
-promise_rejects
+promise_rejects_js
 (
 t
-new
 TypeError
-(
-)
 OtherStorageArea
 .
 prototype
@@ -1341,13 +1335,10 @@
 )
 ;
 await
-promise_rejects
+promise_rejects_js
 (
 t
-new
 TypeError
-(
-)
 OtherStorageArea
 .
 prototype
@@ -1368,14 +1359,11 @@
 realm
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 OtherStorageArea
@@ -1398,14 +1386,11 @@
 realm
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 OtherStorageArea
@@ -1428,14 +1413,11 @@
 realm
 )
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 OtherStorageArea
@@ -1475,14 +1457,11 @@
 .
 get
 ;
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 otherBackingStoreGetter
diff --git a/testing/web-platform/tests/websockets/stream-tentative/constructor.any.js b/testing/web-platform/tests/websockets/stream-tentative/constructor.any.js
index 15719baf8cb85..0b9fd77743288 100644
--- a/testing/web-platform/tests/websockets/stream-tentative/constructor.any.js
+++ b/testing/web-platform/tests/websockets/stream-tentative/constructor.any.js
@@ -40,14 +40,11 @@ test
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -79,12 +76,11 @@ test
 =
 >
 {
-assert_throws
+assert_throws_dom
 (
-new
+"
 SyntaxError
-(
-)
+"
 (
 )
 =
@@ -123,14 +119,11 @@ test
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new
@@ -167,14 +160,11 @@ test
 =
 >
 {
-assert_throws
+assert_throws_js
 (
-new
 TypeError
 (
 )
-(
-)
 =
 >
 new