WASM: setting widget app fullscreen but still draggable

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QPushButton b{"hello world"};
    b.showFullScreen();

    return a.exec();
}

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QPushButton b{"hello world"};
    b.showFullScreen();
    b.setWindowFlags(Qt::Window | Qt::FramelessWindowHint);

    return a.exec();
}

b.setWindowFlags(Qt::FramelessWindowHint);