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+@Section
+ @Title { "@Background" }
+ @Tag { background }
+@Begin
+@PP
+background.sym @Index { @@Background symbol }
+The @@Background symbol will print its left parameter in the
+background of its right parameter. That is, the result has
+the size of the right parameter, but the left parameter will
+be printed first in the same space, with its marks aligned with
+the marks of the right parameter.
+@End @Section