How do I customise the appearance of links in QLabels using style sheets?

One way is to add style="color: whatever" or a class to the inner <span> of the link. I haven't figured out yet how to apply this to the whole application but it's a good start.

Short answer is no. Recently I had to do this.

1. QLabel!visited doesn't work because Qt doesn't track whether QLabel were visited or not.
2. QLabel { color: ... } doesn't work for links. Can't find why but all I found is a suggestion to use QPallete in this case.

I've had little success explicitly setting the QPalette -- it works if you set it for the entire application, but not if you set it in the widget. In the end though, the easiest thing for what I needed to do was use a QTextBrowser instead which supports a subset of HTML. I could then override the colour of links using a regular CSS stylesheet:

QTextBrowser browser;
// IMPORTANT! - set the stylesheet before the content
browser->document()->setDefaultStyleSheet("a {color: white; }");
browser->setText(html);