elisp: Display Property
37.16 The ‘display’ Property
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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’. Examining
Properties.
The rest of this section describes several kinds of display
specifications and what they mean.
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