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(elisp)Overlays

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Overlays
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   You can use "overlays" to alter the appearance of a buffer's text on
the screen, for the sake of presentation features.  An overlay is an
object that belongs to a particular buffer, and has a specified
beginning and end.  It also has properties that you can examine and set;
these affect the display of the text within the overlay.

Overlay Properties

How to read and set properties.

What properties do to the screen display.

Managing Overlays

Creating and moving overlays.

Finding Overlays

Searching for overlays.