When you insert text directly at the place where a marker points, there are two possible ways to relocate that marker: it can point before the inserted text, or point after it. You can specify which one a given marker should do by setting its insertion type. Note that use of
insert-before-markers ignores markers’ insertion types, always relocating a marker to point after the inserted text.
function set-marker-insertion-type marker type
This function sets the insertion type of marker
marker will advance when text is inserted at its position. If
marker does not advance when text is inserted there.
function marker-insertion-type marker
This function reports the current insertion type of
All functions that create markers without accepting an argument that specifies the insertion type, create them with insertion type
nil (see Creating Markers). Also, the mark has, by default, insertion type