I can't get a transparent window

[xiangxw]

#include<QApplication>
#include<QWidget>
#include<QPalette>
#include<QColor>
 
int main ( int argc, char *argv[] )
{
    QApplication app(argc,argv);
    QWidget * widget=new QWidget;
    QPalette pal=widget->palette();
    pal.setColor(QPalette::Background,Qt::transparent);
    widget->setPalette(pal);
    widget->show();
    return app.exec();
}

#include<QApplication>
#include<QWidget>
#include<QPalette>
#include<QColor>

int main ( int argc, char *argv[] )
{
    QApplication app(argc,argv);
    QWidget * widget=new QWidget;
    QPalette pal=widget->palette();
    pal.setColor(QPalette::Background,Qt::transparent);
    widget->setPalette(pal);
    widget->show();
    return app.exec();
}

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