How ensure QWebEngineView is fully rendered

#include <QApplication>
#include <QPrinter>
#include <QWebEngineProfile>
#include <QWebEngineView>
#include <iostream>

auto html =  "<!DOCTYPE html>"
"<html lang=\"en\">"
"<head>"
"  <meta charset=\"UTF-8\">"
"  <style>"
"  img { max-width:100%; max-height:100%; }"
"  div { height: 270px; width: 540px; }"
"  body { margin: 0; background-color: red; }"
"  </style>"
"</head>"
"<body>"
"<div>"
"  <img src=\"https://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73751/world.topo.bathy.200407.3x5400x2700.png\">"
"</div>"
"</body>"
"</html>"
;

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWebEngineView view;
    view.show();
    view.resize(540, 270);

    QObject::connect(&view, &QWebEngineView::loadFinished, [&view](bool isOk) {
       if (!isOk) {
         std::cout << "Error";
          return;
       }
        view.grab().save("page.png", "PNG");
        view.close();
    });

    view.setHtml(html);

    return app.exec();
}