title: Uncaught ReferenceError: WeakMap is not defined
body: <p>In Android Kitkat, I  am getting "Uncaught ReferenceError: WeakMap is not defined" error message on this files:</p>
  
  <ol>
  <li><p><a href="https://s.tradingview.com/static/bundles/embed/embed_events_widget.f6d951f2236fa624e17e.js" rel="nofollow noreferrer">https://s.tradingview.com/static/bundles/embed/embed_events_widget.f6d951f2236fa624e17e.js</a></p></li>
  <li><p><a href="https://s.tradingview.com/static/bundles/embed/embed_tickerswidget.84fde921871ed98f3ff5.js" rel="nofollow noreferrer">https://s.tradingview.com/static/bundles/embed/embed_tickerswidget.84fde921871ed98f3ff5.js</a>
  (49)</p></li>
  <li><p><a href="https://s.tradingview.com/static/bundles/embed/embed_hotlistswidget.193b33cfb6bf1306960f.js" rel="nofollow noreferrer">https://s.tradingview.com/static/bundles/embed/embed_hotlistswidget.193b33cfb6bf1306960f.js</a>
  (148)</p></li>
  <li><p><a href="https://s.tradingview.com/static/bundles/embed/embed_marketoverviewwidget.53a8682d9c0bd1e4350d.js" rel="nofollow noreferrer">https://s.tradingview.com/static/bundles/embed/embed_marketoverviewwidget.53a8682d9c0bd1e4350d.js</a>
  (132)</p></li>
  </ol>
  
  <p>Is there any fix to avoid this error? Thanks.</p>