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-rw-r--r--documentation/common.html10
1 files changed, 10 insertions, 0 deletions
diff --git a/documentation/common.html b/documentation/common.html
index 53e91ad4f..f25477f99 100644
--- a/documentation/common.html
+++ b/documentation/common.html
@@ -350,6 +350,16 @@ Fl::set_boxtype(XYZ_BOX, xyz_draw, 1, 1, 2, 2);
offsets for the x, y, width, and height values that should be
subtracted when drawing the label inside the box.</P>
+<P>A complete box design contains four box types in this order:
+a filled, neutral box (<TT>UP_BOX</TT>), a filled, depressed box
+(<TT>DOWN_BOX</TT>), and the same as outlines only (<TT>UP_FRAME</TT>
+and <TT>DOWN_FRAME</TT>). The function
+<TT><A HREF="#fl_down">fl_down(Fl_Boxtype)</A></TT>
+expects the neutral design on a boxtype with a numerical
+value evenly divideable by two.
+<TT><A HREF="#fl_frame">fl_frame(Fl_Boxtype)</A></TT>
+expects the <TT>UP_BOX</TT> design at a value divideable by four.</P>
+
<H2><A NAME="labels">Labels and Label Types</A></H2>
<P>The <TT>label()</TT>, <TT>align()</TT>, <TT>labelfont()</TT>,