xprop: add page (#6429)

pages/common/xprop.md

@@ -0,0 +1,20 @@
+# xprop
+
+> A tool for displaying window and font properties in an X server.
+> More information: <https://manned.org/xprop>.
+
+- Display the name of the root window:
+
+`xprop -root WM_NAME`
+
+- Display the window manager hints for a window:
+
+`xprop -name "{{window_name}}" WM_HINTS`
+
+- Display the point size of a font:
+
+`xprop -font "{{font_name}}" POINT_SIZE`
+
+- Display all the properties of the window with the id 0x200007:
+
+`xprop -id {{0x200007}}`