The tabulator handling is not correct. I have put the content of a Makefile within a pre element.

The code look as follow:

xy.pdf: file.html
	abcdefghijk	--print-media-type \
			--header-line \
...

The result look like this:

xy.pdf: file.html
	abcdefghijk	    --print-media-type \
			--header-line \
...

Sorry about this, currently Prince expands tabs to eight spaces, and does not align them on the page.