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diff --git a/testing/web-platform/tests/IndexedDB/idbobjectstore_clear3.htm b/testing/web-platform/tests/IndexedDB/idbobjectstore_clear3.htm
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>IDBObjectStore.clear() - If the transaction this IDBObjectStore belongs to has its mode set to readonly, throw ReadOnlyError </title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBObjectStore-clear-IDBRequest">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<div id="log"></div>
+<script>
+    var db,
+        t = async_test(),
+        records = [{ pKey: "primaryKey_0"},
+                   { pKey: "primaryKey_1"}];
+
+    var open_rq = createdb(t);
+    open_rq.onupgradeneeded = function (event) {
+        db = event.target.result;
+        var objStore = db.createObjectStore("store", {keyPath:"pKey"});
+        for (var i = 0; i < records.length; i++) {
+            objStore.add(records[i]);
+        }
+    }
+
+    open_rq.onsuccess = function (event) {
+        var txn = db.transaction("store", "readonly", {durability: 'relaxed'});
+        var ostore = txn.objectStore("store");
+        t.step(function(){
+            assert_throws_dom("ReadOnlyError", function(){
+                ostore.clear();
+            });
+        });
+        t.done();
+    }
+</script>
+