webasm: DropArea does not work

import QtQuick 2.12
import QtQuick.Controls 2.3

ApplicationWindow {
    id: window
    title: "droparea"
    visible: true

    DropArea {
        id: dropArea
        anchors.fill: parent
        keys: ["text/plain"]
        onEntered: print('entered')
        onDropped: {
            showText = drop.text
        }
    }

    Text {
        id: showText
        text: "Drag something here.."
        anchors.left: parent.left
        anchors.bottom: parent.bottom
    }
}