Reading between the lines of your post --literally. I had to look at the source of the html to work out what you were after:) -- I think you want one of these two:

printf "%20s: \n", $_ for 'this', 'that', 'and this other bit';

                this:
                that:
  and this other bit:

printf "%-20s: \n", $_ for 'this', 'that', 'and this other bit';

this                :
that                :
and this other bit  :
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