diff --git a/testing/web-platform/tests/compression/compression-bad-chunks.tentative.any.js b/testing/web-platform/tests/compression/compression-bad-chunks.tentative.any.js
index 2c6727f86fda0..4791dd171e329 100644
--- a/testing/web-platform/tests/compression/compression-bad-chunks.tentative.any.js
+++ b/testing/web-platform/tests/compression/compression-bad-chunks.tentative.any.js
@@ -77,9 +77,24 @@ value
 {
 return
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 }
 }
@@ -100,9 +115,24 @@ new
 Uint8Array
 (
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 )
 }
 }
diff --git a/testing/web-platform/tests/compression/decompression-bad-chunks.tentative.any.js b/testing/web-platform/tests/compression/decompression-bad-chunks.tentative.any.js
index 2a4fb74ad41d4..7700315a95957 100644
--- a/testing/web-platform/tests/compression/decompression-bad-chunks.tentative.any.js
+++ b/testing/web-platform/tests/compression/decompression-bad-chunks.tentative.any.js
@@ -77,9 +77,24 @@ value
 {
 return
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 }
 }
@@ -100,9 +115,24 @@ new
 Uint8Array
 (
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 )
 }
 }
diff --git a/testing/web-platform/tests/css/css-layout-api/constraints-data-sab-failure.https.html b/testing/web-platform/tests/css/css-layout-api/constraints-data-sab-failure.https.html
index 0cc3d6f81f3aa..eca193a5d43f9 100644
--- a/testing/web-platform/tests/css/css-layout-api/constraints-data-sab-failure.https.html
+++ b/testing/web-platform/tests/css/css-layout-api/constraints-data-sab-failure.https.html
@@ -267,16 +267,55 @@
 layoutNextFragment
 (
 {
+/
+/
+See
+https
+:
+/
+/
+github
+.
+com
+/
+whatwg
+/
+html
+/
+issues
+/
+5380
+for
+why
+not
+new
+SharedArrayBuffer
+(
+)
 data
 :
 {
 sab
 :
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
-4
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 }
 }
 )
diff --git a/testing/web-platform/tests/css/css-layout-api/fragment-data-sab-failure.https.html b/testing/web-platform/tests/css/css-layout-api/fragment-data-sab-failure.https.html
index 03fbdc71efab7..061bdfc7c5dda 100644
--- a/testing/web-platform/tests/css/css-layout-api/fragment-data-sab-failure.https.html
+++ b/testing/web-platform/tests/css/css-layout-api/fragment-data-sab-failure.https.html
@@ -276,6 +276,31 @@
 )
 )
 ;
+/
+/
+See
+https
+:
+/
+/
+github
+.
+com
+/
+whatwg
+/
+html
+/
+issues
+/
+5380
+for
+why
+not
+new
+SharedArrayBuffer
+(
+)
 return
 {
 autoBlockSize
@@ -288,10 +313,24 @@
 sab
 :
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
-4
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 }
 }
 ;
diff --git a/testing/web-platform/tests/xhr/send-data-sharedarraybuffer.any.js b/testing/web-platform/tests/xhr/send-data-sharedarraybuffer.any.js
index 8576a4ebe97c1..f0c18da63aeeb 100644
--- a/testing/web-platform/tests/xhr/send-data-sharedarraybuffer.any.js
+++ b/testing/web-platform/tests/xhr/send-data-sharedarraybuffer.any.js
@@ -5,7 +5,7 @@ test
 =
 >
 {
-var
+const
 xhr
 =
 new
@@ -13,13 +13,28 @@ XMLHttpRequest
 (
 )
 ;
-var
+const
 buf
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 xhr
 .
@@ -112,7 +127,7 @@ test
 =
 >
 {
-var
+const
 xhr
 =
 new
@@ -120,7 +135,7 @@ XMLHttpRequest
 (
 )
 ;
-var
+const
 arr
 =
 new
@@ -130,9 +145,24 @@ type
 ]
 (
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 )
 ;
 xhr