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display Property
The display text property (or overlay property) is used to
insert images into text, and to control other aspects of how text
displays. The value of the display property should be a
display specification, or a list or vector containing several display
specifications. Display specifications in the same display
property value generally apply in parallel to the text they cover.
If several sources (overlays and/or a text property) specify values
for the display property, only one of the values takes effect,
following the rules of get-char-property. See Examining Properties.
The rest of this section describes several kinds of display specifications and what they mean.