(PECL haru >= 0.0.1)
HaruAnnotation::setHighlightMode — Set the highlighting mode of the annotation
$mode
   )Defines the appearance of the annotation when clicked. This function may be used with link annotations only.
modeThe highlighting mode of the annotation. Can take only these values:
HaruAnnotation::NO_HIGHLIGHT - no
         highlighting.
        HaruAnnotation::INVERT_BOX - invert the contents
         of the annotation.
        HaruAnnotation::INVERT_BORDER - invert the
         border of the annotation.
        HaruAnnotation::DOWN_APPEARANCE - dent the
         annotation.
        
   Returns TRUE on success.
  
Throws a HaruException on error.