A DESCRIPTION OF THE PROBLEM :
After click on link https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/doc-files/cssref.html#popupwindow (in Contents/Stage/javafx.stage/PopupWindow) is redirect to name "Group" (in bold font in blue color).
Shouldn't it be a "PopupWindow" instead of a "Group"?

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See Description.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
See Description.
ACTUAL -
See Description.