stimate&lt;/a&gt;&lt;/code&gt; dictionary is used by the &lt;code&gt;&lt;a href=&quot;../../js/html/StorageManager.html#StorageManager&quot;&gt;StorageManager&lt;/a&gt;&lt;/code&gt; to provide estimates of the size of a site&#039;s or application&#039;s data store and how much of it is in use. The &lt;code&gt;estimate()&lt;/code&gt; method returns an object that conforms to this dictionary when its &lt;code&gt;&lt;a href=&quot;../../lime/app/Promise.html#Promise&quot;&gt;Promise&lt;/a&gt;&lt;/code&gt; resol