fix(vttjs): wait till tech el in DOM before loading vttjs #4177
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The issue is that in Flash,
Flash.embedwraps theobjectelement in a div but thatobjectelement is what is referenced bythis.el(), so,parentNodeisn't null but we aren't actually in the DOM. Instead, just check to see whether the tech element is in the DOM or not vianode.contains().