+\version "2.19.22"
+
+\header {
+ lsrtags = "editorial-annotations, expressive-marks"
+
+ texidoc = "
+Any graphical object can be printed over a white background to mask
+parts of objects that lie beneath. This can be useful to improve the
+appearance of collisions in complex situations when repositioning
+objects is impractical. It is necessary to explicitly set the
+@code{layer} property to control which objects are masked by the white
+background.
+
+In this example the collision of the tie with the time signature is
+improved by masking out the part of the tie that crosses the time
+signature by setting the @code{whiteout-box} property of
+@code{TimeSignature}. To do this @code{TimeSignature} is moved to a
+layer above @code{Tie}, which is left in the default layer of 1, and
+@code{StaffSymbol} is moved to a layer above @code{TimeSignature} so it
+is not masked.
+
+"
+ doctitle = "Using the whiteout property"
+}
+
+{
+ \override Score.StaffSymbol.layer = #4
+ \override Staff.TimeSignature.layer = #3
+ b'2 b'~
+ \once \override Staff.TimeSignature.whiteout-box = ##t
+ \time 3/4
+ b' r4
+}