The first items would have the same effect if the default line-height is 1em. See the W3Schools
CSS line-height Property for more information.
The second is simply multiple margin shortcuts. For more information, see the W3Schools
CSS Margins
Code:
margin: 0 0 6.24399%; would be top margin 0, left & right margin 0, bottom margin 6.24399%
margin-left: 6.24399%; pretty obviously only sets the left margin to 6.24399%
margin-left: 0.5em; again, sets only the left margin to 0.5em
margin: 0 0 0 6.24399%; this sets the top, right, bottom & left (in that order) margins
Quite a bit of what you are commenting on is likely from the original document that was converted to KFX's semi-compiled format.