When resizing the textt in the application from the code below control using "ctrl" key and middle mouse wheel, then it is possible to resize the html correctly until a minimum size is reached, Then only SOME of the text can be resized up again.

int main(int argc, char **argv)
{
QApplication a(argc, argv);
Q3TextBrowser te;
te.mimeSourceFactory()->setExtensionType("html", "text/html");
te.mimeSourceFactory()->setFilePath(".");
te.setSource("test.html");

te.show();
return a.exec();
}