QT | QSS summarize learning help manual ha ha ha

---

QDockWidget floating window to set the border style is invalid

The reason is that there is a child window inside QDockWidget, the child window covered qdockWidget, so this is actually a child window to apply the style sheet

QDockWidget>QWidget
{
border:2px solid blue;
}

From: https://blog.csdn.net/life_is_too_hard/article/details/78258692