QTextBrowser font-size stylesheet doesn't work all the time

I'm trying to display this HTML with a QTextBrowser:

Quote:

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<h1 style="font-size:100pt;">Test</h1>

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The strange thing is that it doesn't work with setHtml, but looks like the stylesheet is parsed, because when I use toHtml (which wraps it in a span-element), and set it again with setHtml, it works.

Example code:

Code:

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#include <QtGui/QApplication>
#include <QDialog>
#include <QTextBrowser>
#include <QDebug>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QDialog dlg;
    QTextBrowser textBrowser(&dlg);
    textBrowser.setHtml("<h1 style=\"font-size:100pt;\">Test</h1>");
 
#if 1
    QString html = textBrowser.toHtml();
    qDebug() << html;
    textBrowser.setHtml(html);
#endif
 
    textBrowser.setGeometry(0, 0, 500, 500);
    dlg.setGeometry(0, 0, 500, 500);
    dlg.exec();
    return 0;
}

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Change "#if 1" to "#if 0" and it doesn't work. But the toHtml and setHtml workaround has other problems. Maybe I'm doing something wrong? Or is this a bug? (I've tried it with Qt 4.6.2)