<!DOCTYPE html> <html> <head> <title>dynamic maction and embellished op</title> </head> <body> <p>'<math><maction id="m1" selection="2"><mi>a</mi><mo>b</mo></maction></math>'</p> <p>'<math><maction id="m2" selection="2"><mo>b</mo><mi>a</mi></maction></math>'</p> <p>"<math><maction id="m3"><mo>b</mo></maction></math>"</p> <p>"<math><maction id="m3bis"><mi>a</mi><mo>b</mo></maction></math>"</p> <p>{<math><maction id="m4"><mi>a</mi></maction></math>}</p> <p>{<math><maction id="m4bis"><mo>b</mo><mi>a</mi></maction></math>}</p> <p>[<math> <mstyle id="m5" selection="2"><maction><mi>a</mi><mo>b</mo></maction></mstyle> </math>]</p> <p>[<math> <mstyle id="m6" selection="2"><maction><mo>b</mo><mi>a</mi></maction></mstyle> </math>]</p> <p>(<math id="m7" selection="2"><maction><mi>a</mi><mo>b</mo></maction></math>)</p> <p>(<math id="m8" selection="2"><maction><mo>b</mo><mi>a</mi></maction></math>)</p> </body> </html>