The following should produce the same result:

Use of milestone/@n:

Trailing label after a milestone: My label My label My label My label My label My label My label My label

Use of fw; after a pagelike milestone or pb, is incorporated into the page break; otherwise it is treated separately. Hello Hello Hello Hello

fw with/without @n (for now we don't display the @n) and with/without contents Hello Hello Hello

fw with a valid @place: Hello Hello Hello Hello Hello Hello Hello Hello

fw with an invalid @place: Hello Hello

Using several consecutive fw elements is possible: Hello Hello

Use of both label and fw after milestones. The label must immediately follow the milestone. My label Hello Hello

Space handling. If the milestone has @break=no, all spaces around it are removed. But if not, we modify the text in such a way that there is one space (and only one) around each milestone. Except that, if the milestone appears at the very beginning of a block, we don't add a space before it.

done!

done!