ADDITIONAL SYSTEM INFORMATION :
Windows Temurin 17

A DESCRIPTION OF THE PROBLEM :
URL.getFile() returns a URL encoded string. It must be decoded to get a usable file name.

URL decode this line:
https://github.com/openjdk/jfx/blob/e24eeceb28741f4a044ea2cb0cb23a1174b27c66/modules/javafx.graphics/src/main/java/javafx/scene/text/Font.java#L470

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Font.loadFont("file:/C:/path%20with%20spaces/font.ttf", 12);

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It returns a loaded font
ACTUAL -
It returns null

---------- BEGIN SOURCE ----------
Font.loadFont("file:/C:/path%20with%20spaces/font.ttf", 12);
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Open input stream and load fonts like that. Doesn't help CSS though.

FREQUENCY : always