У вашего броузера проблема в совместимости с HTML5
The start wasn't as hard as I thought it would be, got it first try. Quite a few laggy parts here. I think I'll stop here.
Journey to Hell http://doomedsda.us/lmps/1257/jth.zip
Guncaster https://forum.zdoom.org/viewtopic.php?f=43&t=60984
Colourful Hell https://forum.zdoom.org/viewtopic.php?f=43&t=47980
Guncaster Adapter https://forum.zdoom.org/viewtopic.php?f=43&t=63660
Target Spy https://forum.zdoom.org/viewtopic.php?f=43&t=60784
Motion Blur https://forum.zdoom.org/viewtopic.php?f=103&t=62772
Sound Caulking https://www.doomworld.com/forum/topic/71133-sound-caulking-now-on-idgames/
Smooth Fluids https://forum.zdoom.org/viewtopic.php?f=37&t=55161
Minor Sprite Fixing Project https://www.doomworld.com/forum/topic/62403-doom-2-minor-sprite-fixing-project-v19-release-updated-12718/
Brightmaps Collection for GZDoom https://allfearthesentinel.net/zandronum/wadinfo.php?id=1990
Doors Stay Open http://forum.zdoom.org/download/file.php?id=12049
Soundfont Replacement http://www.alsa-project.org/~james/sound-fonts/8MBGMSFX.SF2