Stack Widget on top of WebEngineView

yuanhong

I want stack a widget on top of WebEngineView. code as:
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QWebEngineView *wev = new QWebEngineView(this);
wev->show();

QWidget *z = new QWidget(wev);
z->setMinimumSize(QSize(400,400));
z->setGeometry(0, 0, 100, 100);

z->show();

wev->stackUnder(z);

}

but the widget doesn't get display

yuanhong

Can any one help me for this issue?