CSS HTML Validator Pro is used as the program editor and validate HTML, CSS and PHP code. The simulator and website were developed and maintained using this tool.


  • 02 Sep '20 Updated to 20.0400
  • 14 Jan '21 Updated to 21.0003
  • 19 Jan '21 Updated to 21.0005
  • 23 Mar '21 Updated to 21.01
  • 23 Apr '21 Updated to 21.02
  • 21 Jun '21 Updated to 21,0302
  • 24 Aug '21 Updated to 21.04
  • 12 Jan '22 Updated to 22.0004
  • 12 Feb '22 Updated to 22.0010
  • 24 Feb '22 Updated to 22.0100
  • ???? Updated to 22.0200
  • 20 May '22 updated to 22.0210
  • 31 May '22 Miner update to 22.0220
  • 20 Jul '22 update to 22.0300
  • 29 Sep '22 update to 22.0400
  • 18 Jan '23 Major update to 23.0010
  • 20 Mar '23 Minor update to 23.0100
  • 11 May '23        Minor update to 23.0200
  • 4 Jul '23 Update to 23.0300
  • 5 Jan '24 updated to 24.0000
  • 5 Jan '24 updated to 24.0010
  • 22 Feb '24 minor update to 24.0100
  • 30 Apt '24 updated to 24.0200
  • 24 Jun '24 minor update to 24.0300
  • 17 Oct '24 Updated to 24.0310