I've noticed that QWebEngine set word-wrap by default to tooltips (set by title attribute). Here's some screenshots using QWebEngine and other browsers (Chrome, Firefox, Opera and Edge):
Other browsers :
And here's the link for the sample above, so you can reproduce the bug, and check if it's truly a bug.
- relates to
QTBUG-41051 Adjustable tooltip widths (also for non-rich-text tooltips)
- resulted in
QTBUG-76122 Hover-over text does not wrap