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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>IDBIndex.count() - throw DataError when using invalid key</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-IDBIndex-count-IDBRequest-any-key">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support.js"></script>
+<div id="log"></div>
+<script>
+ var db, t = async_test();
+
+ var open_rq = createdb(t);
+
+ open_rq.onupgradeneeded = function(e) {
+ db = e.target.result;
+ var store = db.createObjectStore("store", { autoIncrement: true });
+ store.createIndex("index", "indexedProperty");
+
+ for(var i = 0; i < 10; i++) {
+ store.add({ indexedProperty: "data" + i });
+ }
+ }
+
+ open_rq.onsuccess = function(e) {
+ var index = db.transaction("store")
+ .objectStore("store")
+ .index("index");
+
+ assert_throws("DataError", function() {
+ index.count(NaN);
+ });
+
+ t.done();
+ }
+</script>
+