A demonstration should be sufficient I think. mdoc(7) in a terminal:
... Spacing is suppressed after opening delimiters and before closing delimiters. For example, .Aq ( [ word ] ) . renders as: ([⟨word⟩]). But http://man.openbsd.org/mdoc.7 appears as: ... Spacing is suppressed after opening delimiters and before closing delimiters. For example, .Aq ( [ word ] ) . renders as: ([⟨word⟩ ]). The offending HTML source (plus one line): <div class="Bd Bd-indent">.Aq ( [ word ] ) .</div> <p class="Pp">renders as:</p> <p class="Pp"></p> <div class="Bd Bd-indent">([⟨word⟩</div> ]). <p class="Pp">Opening delimiters are:</p> Cheers, Matthew