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require 'rvg/rvg'
rvg = Magick::RVG.new(150, 100) do |canvas|
canvas.background_fill = 'white'
canvas.text(40, 35).styles(font_weight: 'bold', font_size: 28) do |txt|
txt.tspan('H')
txt.tspan('2').styles(font_size: 20, fill: 'red', baseline_shift: 'sub')
txt.tspan('O')
end
canvas.text(40, 80).styles(font_style: 'italic', font_size: 28) do |txt|
txt.tspan('e=mc')
txt.tspan('2').styles(font_size: 20, fill: 'red', baseline_shift: 'super')
end
canvas.rect(149, 99).styles(fill: 'none', stroke: 'blue')
end
rvg.draw.write('baseline_shift01.gif')
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