On any wiki:
- type something in source edit box until the last word wraps to the next line;
- type space as the first symbol of new line (before wrapped word);
- press "preview".
As you can see the space at the end of first line was converted to "end of line" caracter, and the space in the beginning of second line makes this line appear boxed (as it shoud be when you use space at the beginning of new paragraph).