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(elisp)Display Property

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The `display' Property
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   The `display' text property (or overlay property) is used to insert
images into text, and also control other aspects of how text displays.
These features are available starting in Emacs 21.  The value of the
`display' property should be a display specification, or a list or
vector containing several display specifications.  The rest of this
section describes several kinds of display specifications and what they
mean.

Specified Space

Displaying one space with a specified width.

Other Display Specs

Displaying an image; magnifying text; moving it

up or down on the page; adjusting the width of spaces within text.

Display Margins

Displaying text or images to the side of the main text.

Conditional Display

Making any of the above features conditional

depending on some Lisp expression.