These text properties affect the behavior of the fill commands. They
are used for representing formatted text. See Filling, and
Margins.
hard
If a newline character has this property, it is a “hard” newline.
The fill commands do not alter hard newlines and do not move words
across them. However, this property takes effect only if the
use-hard-newlines minor mode is enabled. See Hard and Soft Newlines.
right-margin
This property specifies an extra right margin for filling this part of the
text.
left-margin
This property specifies an extra left margin for filling this part of the
text.
justification
This property specifies the style of justification for filling this part
of the text.