i'm just teasing. i was actually thinking of swearing back at u -- jokingly -- striking it out, and changing it to "thank u".
but try as i may, i could not reverse engineer how u did that! reply window showed your text already struck thru -- not set off with magic tags as i was expecting -- as did page source even! (with the odd quirk that the strikethru runs one char late there. i.e. the "y" is unstruck, then everything else PLUS ONE MORE, UNRELATED, CHAR is struckthru)
on google, i find tags "del" and "s", the latter a replacement for earlier tag "strike". i tried all 3. i also find no shortage of shortcuts and hotkeys -- "alt-H-4", "ctrl-shift-S", "ctrl-D, alt-K" in sequence, "ctrl-D, ctrl-alt-plus" in sequence, strikethru key on some "font control popup" (not the one here in the reply window, i should note), to setting "CSS attribute: text-decoration = line-through")...NONE of which work!! (except for that last one which i don't even know what to do with)
finally, i considered that maybe there is a struckthru CHARSET. but neither my charmap nor anything googling up reveals one. so i cudn't even do a cut-paste from there.
as a KLUDGE, i figure i'll just cut/paste your reply as is, then insert my text in the middle and trim away yours from the sides (leaving mine inside w/e strikethru macro is at play, even if i can't see it, but that didn't work either. w/e i inserted shows up naked (e.g. y̶o̶u̶ ̶m̶e̶TESTa̶n̶ ̶l̶i̶k̶e̶ ̶t̶h̶i̶s̶ ̶?̶) so THAT was a wash.
thinking back to my early days on a VT-100, i wonder if it's some sort of "backspace" trick -- letting u overlay a regular hyphen -- but i wouldn't have a CLUE how to effect one.
so i think i am officially at the end. should i get a sharpie and draw it in before hitting post?