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diff --git a/testing/web-platform/tests/websockets/interfaces/WebSocket/url/006.html b/testing/web-platform/tests/websockets/interfaces/WebSocket/url/006.html
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index 0000000000..6e83770405
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+++ b/testing/web-platform/tests/websockets/interfaces/WebSocket/url/006.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: defineProperty setter for url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="?default">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  window.setter_ran = false;
+    Object.defineProperty(WebSocket.prototype, 'url', {
+        set: function(v) { window[v] = true; }
+    });
+    var ws = new WebSocket('ws://example.invalid/');
+    ws.url = 'setter_ran';
+    assert_true(setter_ran);
+});
+</script>