Получить иконку сайта в QWebView

    QIcon icon;
    icon=web->icon()

#ifndef MAINWINDOW_H
#define MAINWINDO
#include <QIcon>
#include <QLabel>
#include <QWebView>
#include <QMainWindow>

class MainWindow : public QWidget
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    QWebView* web;
    QLabel* lbl;
public slots:
    void ChangeIcon();
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include <QVBoxLayout>
MainWindow::MainWindow(QWidget *parent) :
    QWidget(parent)
{
    web = new QWebView;
    web->load(QUrl("https://yandex.ru"));
    QIcon icon;
    icon=web->icon();
    lbl = new QLabel;
    lbl->setPixmap(QIcon(icon).pixmap(20,20));
    QObject::connect(web,SIGNAL(iconChanged()),this,SLOT(ChangeIcon()));
    QVBoxLayout* box = new QVBoxLayout;
    box->addWidget(web);
    box->addWidget(lbl);
    setLayout(box);
}
void MainWindow::ChangeIcon(){
    QIcon icon;
    icon=web->icon();
    lbl->setPixmap(QIcon(icon).pixmap(20,20));
}