Pipe raw HTML to browser (OS X). Also takes file arguments.

htmlpipe.sh

:; I="$(basename $0)"; [ -z $BROWSER ] && open=open || open="$BROWSER"

[ $# -eq 0 ] && set -- -; [ "$1" = "-" ] && [ -t 0 ] &&
  echo "Usage: [ COMMAND | $I ] | [ $I < FILE ] | [ $I FILE ... ]" >&2 && exit

for what; do where="/tmp/$(od -N2 < /dev/urandom | openssl dgst -sha1).html"
 cat "$what" > "$where" && $open "$where"; sleep 1 && rm -f "$where" & done

                                          ## Or, you might prefer what I use:
# cat "$what" > "$where" && qlmanage -p "$where" >/dev/null 2>&1; sleep 1 ...