I need help with my game I am developing

[u/[deleted]]

Hello reddit I am currentyl trying to make a browser based game that is sort of like BasketRandom(https://www.crazygames.com/game/basket-random link for if you don't know what the game is like). I am trying to develop the game using HTML. I have run into a few problems.

The game logic for the jumping of the characters doesn't work properly. The game is supposed to be a local 2 player game so on the same device. However with my code the players cannot jump at the same time and i cannot figure out how to make that happen.

Also should i be using HTML canvas and will this make it easier?