Indexed DB / Multientry Indexes

<!DOCTYPE html>
<title>IndexedDB: Test the limits on multientry indexes</title>
<script>

var NUM_ENTRIES = 1e4;

var openRequest = indexedDB.open('db' + Date.now());
openRequest.onupgradeneeded = function() {
  var db = openRequest.result;
  var store = db.createObjectStore('store', {keyPath: 'id'});
  store.createIndex('tags', 'tags', {unique: false, multiEntry: true});
};
openRequest.onsuccess = function() {
  var db = openRequest.result;
  var tx = db.transaction('store', 'readwrite');
  var store = tx.objectStore('store');
  var index = store.index('tags');

  var rec = {id: 1234, tags: []};
  for (var i = 0; i < NUM_ENTRIES; ++i) {
    rec.tags[i] = i;
  }
  store.put(rec);

  var countRequest = index.count();
  countRequest.onsuccess = function() {
    alert(countRequest.result);
  };
};

</script>