diff -r 000000000000 -r 6474c204b198 dom/workers/test/url_exceptions_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/url_exceptions_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+function ok(a, msg) {
+  postMessage({type: 'status', status: !!a, msg: msg });
+}
+
+onmessage = function(event) {
+  // URL.href throws
+  var url = new URL('http://www.example.com');
+  ok(url, "URL created");
+
+  var status = false;
+  try {
+    url.href = '42';
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "url.href = 42 should throw");
+
+  url.href = 'http://www.example.org';
+  ok(true, "url.href should not throw");
+
+  status = false
+  try {
+    new URL('42');
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "new URL(42) should throw");
+
+  status = false
+  try {
+    new URL('http://www.example.com', '42');
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "new URL(something, 42) should throw");
+
+  postMessage({type: 'finish' });
+}