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diff --git a/testing/web-platform/tests/webmessaging/without-ports/011.html b/testing/web-platform/tests/webmessaging/without-ports/011.html
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+++ b/testing/web-platform/tests/webmessaging/without-ports/011.html
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+<!doctype html>
+<title>posting an imagedata (from a cloned canvas) in an array</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(function() {
+
+  var canvas = document.createElement('canvas');
+  var clone = canvas.cloneNode(true);
+  var ctx = clone.getContext('2d');
+  var imagedata = ctx.getImageData(0, 0, 300, 150);
+  postMessage([imagedata], '*');
+
+  onmessage = this.step_func(function(e) {
+    function processPixels(imagedata) {
+      var pixeldata = imagedata.data;
+      for (var i = 0; i < pixeldata.length; i = i+4) {
+        pixeldata[i] = 128;
+        assert_equals(pixeldata[i], 128);
+      }
+    }
+    processPixels(e.data[0]);
+    this.done();
+  });
+
+});
+</script>
+