While Qt Assistant from Qt 5.6.2 renders Qt4 documentation acceptable well, integrated help of QtC renders function declarations so small that it is very difficult to click on a function to get to its description. Zooming in doesn't change text size for normal text but only for titles.

This is most probably a Qt5.8 issue but I thought it should first be reported to QtC. Feel free to convert it to a QTBUG or let me know how documentation is rendered in QtC (QTextBrowser, QtWebEngine, something else) so that I can file it properly.