HTML context menu overrides QWebEngineView context menu

If web page provides custom context menu like   

function contextMenuListener(el) {   
  el.addEventListener( "contextmenu", function(e) {     
    e.preventDefault(); 
  }); 
}

QWebEngineView would not invoke it's own context menu and show JS one. QWebEngineView's context menu could not be invoked even by force sending QContextMenuEvent to it or it's children.