diff --git a/testing/web-platform/tests/common/sab.js b/testing/web-platform/tests/common/sab.js
new file mode 100644
index 000000000000..df2c13411a4c
--- /dev/null
+++ b/testing/web-platform/tests/common/sab.js
@@ -0,0 +1,13 @@
+const createBuffer = (() => {
+  
+  const sabConstructor = new WebAssembly.Memory({ shared:true, initial:0, maximum:0 }).buffer.constructor;
+  return (type, length) => {
+    if (type === "ArrayBuffer") {
+      return new ArrayBuffer(length);
+    } else if (type === "SharedArrayBuffer") {
+      return new sabConstructor(length);
+    } else {
+      throw new Error("type has to be ArrayBuffer or SharedArrayBuffer");
+    }
+  }
+})();
diff --git a/testing/web-platform/tests/encoding/encodeInto.any.js b/testing/web-platform/tests/encoding/encodeInto.any.js
index d218a8d3dc71..9ec66f32b6f4 100644
--- a/testing/web-platform/tests/encoding/encodeInto.any.js
+++ b/testing/web-platform/tests/encoding/encodeInto.any.js
@@ -1,3 +1,6 @@
+
+
+
 [
   {
     "input": "Hi",
@@ -77,15 +80,15 @@
     ["ArrayBuffer", "SharedArrayBuffer"].forEach(arrayBufferOrSharedArrayBuffer => {
       test(() => {
         
-        const bufferLength = testData.destinationLength + destinationData.bufferIncrease,
-              destinationOffset = destinationData.destinationOffset,
-              destinationLength = testData.destinationLength,
-              destinationFiller = destinationData.filler,
-              encoder = new TextEncoder(),
-              buffer = new self[arrayBufferOrSharedArrayBuffer](bufferLength),
-              view = new Uint8Array(buffer, destinationOffset, destinationLength),
-              fullView = new Uint8Array(buffer),
-              control = new Array(bufferLength);
+        const bufferLength = testData.destinationLength + destinationData.bufferIncrease;
+        const destinationOffset = destinationData.destinationOffset;
+        const destinationLength = testData.destinationLength;
+        const destinationFiller = destinationData.filler;
+        const encoder = new TextEncoder();
+        const buffer = createBuffer(arrayBufferOrSharedArrayBuffer, bufferLength);
+        const view = new Uint8Array(buffer, destinationOffset, destinationLength);
+        const fullView = new Uint8Array(buffer);
+        const control = new Array(bufferLength);
         let byte = destinationFiller;
         for (let i = 0; i < bufferLength; i++) {
           if (destinationFiller === "random") {
@@ -128,19 +131,17 @@
  Float64Array].forEach(view => {
   ["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
     test(() => {
-      assert_throws_js(TypeError, () => new TextEncoder().encodeInto("", new view(new self[arrayBufferOrSharedArrayBuffer](0))));
+      assert_throws_js(TypeError, () => new TextEncoder().encodeInto("", new view(createBuffer(arrayBufferOrSharedArrayBuffer, 0))));
     }, "Invalid encodeInto() destination: " + view.name + ", backed by: " + arrayBufferOrSharedArrayBuffer);
   });
 });
 
 ["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
   test(() => {
-    assert_throws_js(TypeError, () => new TextEncoder().encodeInto("", new self[arrayBufferOrSharedArrayBuffer](10)));
+    assert_throws_js(TypeError, () => new TextEncoder().encodeInto("", createBuffer(arrayBufferOrSharedArrayBuffer, 10)));
   }, "Invalid encodeInto() destination: " + arrayBufferOrSharedArrayBuffer);
 });
 
-
-
 test(() => {
   const buffer = new ArrayBuffer(10),
         view = new Uint8Array(buffer);
diff --git a/testing/web-platform/tests/encoding/streams/decode-utf8.any.js b/testing/web-platform/tests/encoding/streams/decode-utf8.any.js
index a8e7ac10e298..a99a1b60d86b 100644
--- a/testing/web-platform/tests/encoding/streams/decode-utf8.any.js
+++ b/testing/web-platform/tests/encoding/streams/decode-utf8.any.js
@@ -5,11 +5,10 @@
 'use strict';
 
 ["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
-  const inputChunkData = [73, 32, 240, 159, 146, 153, 32, 115, 116,
-                          114, 101, 97, 109, 115]
+  const inputChunkData = [73, 32, 240, 159, 146, 153, 32, 115, 116, 114, 101, 97, 109, 115];
 
-  const emptyChunk = new Uint8Array(new self[arrayBufferOrSharedArrayBuffer](0));
-  const inputChunk = new Uint8Array(new self[arrayBufferOrSharedArrayBuffer](inputChunkData.length));
+  const emptyChunk = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, 0));
+  const inputChunk = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, inputChunkData.length));
 
   inputChunk.set(inputChunkData);
 
diff --git a/testing/web-platform/tests/encoding/textdecoder-copy.any.js b/testing/web-platform/tests/encoding/textdecoder-copy.any.js
index 6ae65119db68..59590528303e 100644
--- a/testing/web-platform/tests/encoding/textdecoder-copy.any.js
+++ b/testing/web-platform/tests/encoding/textdecoder-copy.any.js
@@ -1,10 +1,13 @@
+
+
+
 ["ArrayBuffer", "SharedArrayBuffer"].forEach(arrayBufferOrSharedArrayBuffer => {
   test(() => {
-    const buf = new self[arrayBufferOrSharedArrayBuffer](2),
-          view = new Uint8Array(buf),
-          buf2 = new self[arrayBufferOrSharedArrayBuffer](2),
-          view2 = new Uint8Array(buf2),
-          decoder = new TextDecoder("utf-8");
+    const buf = createBuffer(arrayBufferOrSharedArrayBuffer, 2);
+    const view = new Uint8Array(buf);
+    const buf2 = createBuffer(arrayBufferOrSharedArrayBuffer, 2);
+    const view2 = new Uint8Array(buf2);
+    const decoder = new TextDecoder("utf-8");
     view[0] = 0xEF;
     view[1] = 0xBB;
     view2[0] = 0xBF;
diff --git a/testing/web-platform/tests/encoding/textdecoder-streaming.any.js b/testing/web-platform/tests/encoding/textdecoder-streaming.any.js
index 4e1385f46294..c9242974d828 100644
--- a/testing/web-platform/tests/encoding/textdecoder-streaming.any.js
+++ b/testing/web-platform/tests/encoding/textdecoder-streaming.any.js
@@ -1,6 +1,8 @@
 
 
 
+
+
 var string = '\x00123ABCabc\x80\xFF\u0100\u1000\uFFFD\uD800\uDC00\uDBFF\uDFFF';
 var octets = {
     'utf-8':    [0x00,0x31,0x32,0x33,0x41,0x42,0x43,0x61,0x62,0x63,0xc2,0x80,
@@ -28,7 +30,7 @@ var octets = {
                     var sub = [];
                     for (var j = i; j < encoded.length && j < i + len; ++j)
                         sub.push(encoded[j]);
-                        var uintArray = new Uint8Array(new self[arrayBufferOrSharedArrayBuffer](sub.length));
+                        var uintArray = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, sub.length));
                         uintArray.set(sub);
                     out += decoder.decode(uintArray, {stream: true});
                 }