...WebGL may actually have something to do with music; it functions differently than EXE.
Whenever I pause the game, the music pauses as well, but in the WebGL, it secretly goes out of sync and rapidly fast before I unpause it and ended up out of sync.
This is the Super Text Mesh support forum, so if something is wrong with your game's background music and it's unrelated to Super Text Mesh, I've become a bit too busy to be able to help, sorry!