Html <select> <option> combobox not drops down in QML's WebView

 
import QtQuick 2.2
import QtWebKit 3.0

Rectangle {
    width: 600
    height: 600

    WebView {
        anchors.fill: parent
        url: "http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_option_selected"
        
    }
}