PostScript is an actively used text markup language created in 1982.

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Example code from the Hello World Collection:

% Hello World in Postscript
%!PS
/Palatino-Roman findfont
100 scalefont
setfont
100 100 moveto
(Hello World!) show
showpage

Example code from Linguist:

%!PS-Adobe-3.0
%%Creator: Aaron Puchert
%%Title: The Sierpinski triangle
%%Pages: 1
%%PageOrder: Ascend

%%BeginProlog
% PAGE SETTINGS
/pageset {
  28.3464566 28.3464566 scale    % set cm = 1
  0.5 0.5 translate
  0 setlinewidth
} def

% sierpinski(n) draws a sierpinski triangle of order n
/sierpinski {
dup 0 gt {
  [0.5 0 0 0.5 0 0] concat dup 1 sub sierpinski
  [1 0 0 1 1 0] concat dup 1 sub sierpinski
  [1 0 0 1 -1 1] concat dup 1 sub sierpinski
  [2 0 0 2 0 -1] concat
} {
  newpath
    0 0 moveto
    1 0 lineto
    0 1 lineto
  closepath
  fill
} ifelse pop} def
%%EndProlog

%%BeginSetup
<< /PageSize [596 843] >> setpagedevice  % A4
%%EndSetup

%%Page: Test 1
pageset
[20 0 10 300 sqrt 0 0] concat
9 sierpinski
showpage
%%EOF

Example code from Wikipedia:

/mm {360 mul 127 div} def
 0 0 moveto
 0 40 mm lineto stroke
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Last updated February 11th, 2019